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](https://github.com/actions/checkout/compare/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>

.github/workflows/onpr_check-pr.yaml

@@ -18,7 +18,7 @@ jobs:
       changedChangelogFiles: ${{ steps.changed-files.outputs.changelogs_files }}
     steps:
       - name: Checkout repo
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Find changed addon directories
         id: find_addons
         run: |
@@ -72,7 +72,7 @@ jobs:
         addon: ${{ fromJSON(needs.check-addon-changes.outputs.changedAddons) }}
     steps:
       - name: ↩️ Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: 🔎 Check if a label for the addon exists
         shell: bash
@@ -94,7 +94,7 @@ jobs:
         addon: ${{ fromJSON(needs.check-addon-changes.outputs.changedAddons) }}
     steps:
       - name: ↩️ Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: 🔎 Run Home Assistant Add-on Lint
         uses: frenck/action-addon-linter@v2
@@ -112,7 +112,7 @@ jobs:
         addon: ${{ fromJSON(needs.check-addon-changes.outputs.changedAddons) }}
     steps:
       - name: ↩️ Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: ℹ️ Gather addon info
         id: information