Bump actions/checkout from 5.0.0 to 6.0.0 (#4721)

Bumps [actions/checkout](https://github.com/actions/checkout) from 5.0.0 to 6.0.0.
- [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/v5.0.0...v6.0.0)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: 6.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/lint.yml

@@ -19,7 +19,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out repository
-        uses: actions/checkout@v5.0.0
+        uses: actions/checkout@v6.0.0
 
       - name: Validate
         run: jq --raw-output . appdaemon blacklist critical integration netdaemon plugin python_script removed template theme
@@ -29,7 +29,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out repository
-        uses: actions/checkout@v5.0.0
+        uses: actions/checkout@v6.0.0
 
       - name: Critical
         uses: cardinalby/schema-validator-action@3.1.1
@@ -54,7 +54,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out repository
-        uses: actions/checkout@v5.0.0
+        uses: actions/checkout@v6.0.0
 
       - name: Set up Python
         uses: actions/setup-python@v6.0.0