Bump actions/checkout from 4.1.4 to 4.1.5 in the github-actions group

Bumps the github-actions group with 1 update: [actions/checkout](https://github.com/actions/checkout).


Updates `actions/checkout` from 4.1.4 to 4.1.5
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@0ad4b8f...44c2b7a)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: github-actions
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/validation.yml

@@ -13,6 +13,6 @@ jobs:
     name: Validate against TEI_all
     steps:
       - name: Checkout
-        uses: actions/checkout@0ad4b8fadaa221de15dcec353f45205ec38ea70b # v4.1.4
+        uses: actions/checkout@44c2b7a8a4ea60a981eaca3cf939b5f4305c123b # v4.1.5
       - name: Validate
         uses: dracor-org/tei-validate-action@94b08b8bf0dd1810fe7962aa59435b46c769bbcb # v1.2.0