chore(deps): bump actions/checkout from 5 to 6 (#2118)

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

Author: dependabot[bot]

.github/workflows/sync-plugin-manager.yml

@@ -12,7 +12,7 @@ jobs:
     if: github.repository_owner == 'jenkinsci'
     steps:
       - name: Check out source code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: PLUGIN_CLI_VERSION
         id: lts

.github/workflows/update-dockerhub-description.yml

@@ -8,7 +8,7 @@ jobs:
   dockerHubDescription:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Update Docker Hub description
         uses: peter-evans/dockerhub-description@v5
         with:

.github/workflows/updatecli.yaml

@@ -13,7 +13,7 @@ jobs:
     if: github.repository_owner == 'jenkinsci'
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Install Updatecli in the runner
         uses: updatecli/[email protected]