chore(deps): update actions/checkout action to v6 (#989)

Reviewed-on: https://gitea.com/gitea/helm-gitea/pulls/989
Co-authored-by: Renovate Bot <[email protected]>
Co-committed-by: Renovate Bot <[email protected]>

.gitea/workflows/release-version.yml

@@ -9,7 +9,7 @@ jobs:
   generate-chart-publish:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
 
@@ -104,7 +104,7 @@ jobs:
       - name: install tools
         run: |
           apk add -q --update --no-cache nodejs
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-tags: true
           fetch-depth: 0