ci: bump actions/checkout from 6.1.0 to 7.0.1

Bumps [actions/checkout](https://github.com/actions/checkout) from 6.1.0 to 7.0.1.
- [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/d23441a48e516b6c34aea4fa41551a30e30af803...3d3c42e5aac5ba805825da76410c181273ba90b1)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: 7.0.1
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/validate_issue.yml

@@ -15,7 +15,7 @@ jobs:
       contains(github.event.issue.labels.*.name, 'streams:edit')
     steps:
       - name: Checkout repository code
-        uses: actions/checkout@d23441a48e516b6c34aea4fa41551a30e30af803 # v6.1.0
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
 
       - uses: tibdex/github-app-token@0d49dd721133f900ebd5e0dff2810704e8defbc6 # v1.8.2
         if: ${{ !env.ACT }}