Bump actions/checkout from 2 to 6 (#234)

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

Author: dependabot[bot]

.github/workflows/gg.yml

@@ -52,7 +52,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     needs: version
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v6
 
       - name: Prepare build
         shell: bash
@@ -168,7 +168,7 @@ jobs:
 
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v6
 
       - name: Download stage4 hash
         uses: actions/download-artifact@v8
@@ -212,7 +212,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Source
-        uses: actions/checkout@v2.1.0
+        uses: actions/checkout@v6
 
       - name: Download stage3 / stage4
         uses: actions/download-artifact@v8