dependabot: bump actions/checkout from 3 to 4 (opensearch-project#1098)

Bumps [actions/checkout](https://github.com/actions/checkout) from 3 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v3...v4)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/benchmark.yml

@@ -38,7 +38,7 @@ jobs:
 
       # anomaly-detection
       - name: Checkout AD
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Build and Run Tests
         run: |

.github/workflows/test_build_multi_platform.yml

@@ -85,7 +85,7 @@ jobs:
           java-version: ${{ matrix.java }}
 
       - name: Checkout AD
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Assemble / build / mavenlocal / integTest
         run: |

.github/workflows/test_bwc.yml

@@ -38,7 +38,7 @@ jobs:
 
       # anomaly-detection
       - name: Checkout AD
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Assemble anomaly-detection
         run: |