chore(deps): update @readme/openapi-parser (#1004)

| [![PR App][icn]][pr] | 🚥 Resolves RM-9343 |
| :------------------: | :------------------: |

## 🧰 Changes
This bumps `@readme/openapi-parser` to include these changes:
- readmeio/openapi-parser#259
- readmeio/openapi-parser#264

These fix an issue where the existence of the `description` property
under `server.variables` would fail validation.


## 💁 Customer Impact
Customers should be able to upload valid OAS 3.1 files again without
error'ing.

## 🧬 QA & Testing
The following OAS file should not hit any validation errors:

<details>
<summary>OAS 3.1 file</summary>

```json
{
  "openapi": "3.1.0",
  "info": {
    "version": "1.0",
    "title": "Invalid API"
  },
  "servers": [
    {
      "url": "https://{subdomain}.io",
      "variables": {
        "subdomain": {
          "default": "petstore",
          "description": "Subdomain description"
        }

      }
    }
  ],
  "paths": {
    "/anything": {
      "get": {
        "responses": {
          "200": {
            "description": "OK",
            "content": {
              "application/json": {
                "schema": {
                  "type": "array",
                  "items": {
                    "$ref": "#/components/schemas/User-Information"
                  }
                }
              }
            }
          }
        }
      }
    }
  },
  "components": {
    "schemas": {
      "User-Information": {
        "type": "object",
        "properties": {
          "first": {
            "type": "boolean"
          },
          "last": {
            "type": "boolean"
          }
        }
      }
    }
  }
}
```
</details>


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__tests__/helpers/github-workflow-schema.json

@@ -264,27 +264,32 @@
     "matrix": {
       "$comment": "https://help.github.com/en/actions/automating-your-workflow-with-github-actions/workflow-syntax-for-github-actions#jobsjob_idstrategymatrix",
       "description": "A build matrix is a set of different configurations of the virtual environment. For example you might run a job against more than one supported version of a language, operating system, or tool. Each configuration is a copy of the job that runs and reports a status.\nYou can specify a matrix by supplying an array for the configuration options. For example, if the GitHub virtual environment supports Node.js versions 6, 8, and 10 you could specify an array of those versions in the matrix.\nWhen you define a matrix of operating systems, you must set the required runs-on keyword to the operating system of the current job, rather than hard-coding the operating system name. To access the operating system name, you can use the matrix.os context parameter to set runs-on. For more information, see https://help.github.com/en/articles/contexts-and-expression-syntax-for-github-actions.",
-      "oneOf": [{ "type": "object" }, { "$ref": "#/definitions/expressionSyntax" }],
-      "patternProperties": {
-        "^(in|ex)clude$": {
-          "$comment": "https://help.github.com/en/actions/automating-your-workflow-with-github-actions/workflow-syntax-for-github-actions#example-including-configurations-in-a-matrix-build",
-          "oneOf": [
-            { "$ref": "#/definitions/expressionSyntax" },
-            {
-              "type": "array",
-              "items": { "type": "object", "additionalProperties": { "$ref": "#/definitions/configuration" } },
-              "minItems": 1
+      "oneOf": [
+        {
+          "type": "object",
+          "patternProperties": {
+            "^(in|ex)clude$": {
+              "$comment": "https://help.github.com/en/actions/automating-your-workflow-with-github-actions/workflow-syntax-for-github-actions#example-including-configurations-in-a-matrix-build",
+              "oneOf": [
+                { "$ref": "#/definitions/expressionSyntax" },
+                {
+                  "type": "array",
+                  "items": { "type": "object", "additionalProperties": { "$ref": "#/definitions/configuration" } },
+                  "minItems": 1
+                }
+              ]
             }
-          ]
-        }
-      },
-      "additionalProperties": {
-        "oneOf": [
-          { "type": "array", "items": { "$ref": "#/definitions/configuration" }, "minItems": 1 },
-          { "$ref": "#/definitions/expressionSyntax" }
-        ]
-      },
-      "minProperties": 1
+          },
+          "additionalProperties": {
+            "oneOf": [
+              { "type": "array", "items": { "$ref": "#/definitions/configuration" }, "minItems": 1 },
+              { "$ref": "#/definitions/expressionSyntax" }
+            ]
+          },
+          "minProperties": 1
+        },
+        { "$ref": "#/definitions/expressionSyntax" }
+      ]
     },
     "reusableWorkflowCallJob": {
       "$comment": "https://docs.github.com/en/actions/learn-github-actions/reusing-workflows#calling-a-reusable-workflow",
@@ -392,7 +397,7 @@
           "oneOf": [{ "type": "string" }, { "$ref": "#/definitions/environment" }]
         },
         "outputs": {
-          "$comment": "https://help.github.com/en/actions/reference/workflow-syntax-for-github-actions#jobsjobs_idoutputs",
+          "$comment": "https://help.github.com/en/actions/reference/workflow-syntax-for-github-actions#jobsjob_idoutputs",
           "description": "A map of outputs for a job. Job outputs are available to all downstream jobs that depend on this job.",
           "type": "object",
           "additionalProperties": { "type": "string" },