[github-actions] Bump actions/checkout from 5 to 6

Bumps [actions/checkout](https://github.com/actions/checkout) from 5 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v5...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/ci.yaml

@@ -34,7 +34,7 @@ jobs:
     name: Check generated files
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: arduino/setup-protoc@v3
       - uses: actions/setup-go@v6
         with:

.github/workflows/codeql-analysis.yml

@@ -31,7 +31,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           # We must fetch at least the immediate parents so that if this is
           # a pull request then we can checkout the head.

.github/workflows/update-dependent-repositories-gomod.yaml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout ${{ github.repository }}
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           path: ${{ github.repository }}
           repository: ${{ github.repository }}
@@ -38,7 +38,7 @@ jobs:
           cat /tmp/commit-message
 
       - name: Checkout networkservicemesh/${{ matrix.repository }}
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           path: networkservicemesh/${{ matrix.repository }}
           repository: networkservicemesh/${{ matrix.repository }}