Bump actions/checkout from 5 to 6 in the github-actions group

Bumps the github-actions group with 1 update: [actions/checkout](https://github.com/actions/checkout).


Updates `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
  dependency-group: github-actions
...

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

Author: dependabot[bot]

.github/workflows/cache-cleanup.yml

@@ -17,7 +17,7 @@ jobs:
 
         steps:
             - name: Check out code
-              uses: actions/checkout@v5
+              uses: actions/checkout@v6
 
             - name: Cleanup cache
               run: |

.github/workflows/linters.yml

@@ -22,7 +22,7 @@ jobs:
 
         steps:
             - name: Checkout code
-              uses: actions/checkout@v5
+              uses: actions/checkout@v6
 
             - name: Install Node.JS
               uses: actions/setup-node@v6

.github/workflows/release.yml

@@ -38,7 +38,7 @@ jobs:
               uses: actions/setup-node@v6
 
             - name: Checkout code
-              uses: actions/checkout@v5
+              uses: actions/checkout@v6
 
             - name: Get version
               id: get_version

.github/workflows/repo-labels-sync.yml

@@ -24,7 +24,7 @@ jobs:
 
         steps:
             - name: Checkout
-              uses: actions/checkout@v5
+              uses: actions/checkout@v6
 
             - name: Run Labeler
               uses: crazy-max/ghaction-github-labeler@v5