chore(deps): bump actions/checkout from 2 to 6

Bumps [actions/checkout](https://github.com/actions/checkout) from 2 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v2...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] <[email protected]>

Author: dependabot[bot]

.github/workflows/validate.yml

@@ -20,7 +20,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: ⬇️ Checkout repo
-        uses: actions/checkout@v2
+        uses: actions/checkout@v6
 
       - name: ⎔ Setup node
         uses: actions/setup-node@v2
@@ -52,7 +52,7 @@ jobs:
       github.ref) && github.event_name == 'push' }}
     steps:
       - name: ⬇️ Checkout repo
-        uses: actions/checkout@v2
+        uses: actions/checkout@v6
 
       - name: ⎔ Setup node
         uses: actions/setup-node@v2