docs: set default-workgroup to "primary"

Signed-off-by: Steve Teuber <[email protected]>

README.md

@@ -36,7 +36,7 @@ See [action.yml](action.yml) for more detail.
 | `query-string`      | The SQL query statements to be executed.                                   | Yes      |
 | `query-context`     | The context within which the query executes.                               | Yes      |
 | `output-location`   | The location in Amazon S3 where your query results are stored.             | Yes      |
-| `query-workgroup`   | The desired workgroup. default="default".                                  | No       |
+| `query-workgroup`   | The desired workgroup. default="primary".                                  | No       |
 | `output-filename`   | The desired name of the file where the query results are stored.           | Yes      |
 | `output-min-size`   | The minimum size of the output file in human-readable format.              | Yes      |
 | `download-location` | The location on the runner machine where the query results are downloaded. | No       |