build(deps): bump actions/checkout from 4 to 5

Bumps [actions/checkout](https://github.com/actions/checkout) from 4 to 5.
- [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/v4...v5)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '5'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
(cherry picked from commit f2af519f2e)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

.github/workflows/validate.yml

@@ -48,7 +48,7 @@ jobs:
     steps:
       -
         name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
       -
         name: Generate
         shell: 'script --return --quiet --command "bash {0}"'
@@ -74,7 +74,7 @@ jobs:
     steps:
       -
         name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
       -
         name: Run
         shell: 'script --return --quiet --command "bash {0}"'