Bump actions/checkout from 5 to 6

Bumps [actions/checkout](https://github.com/actions/checkout) from 5 to 6.
- [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/v5...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]>

.github/workflows/get-new-tool-versions.yml

@@ -30,7 +30,7 @@ jobs:
     outputs:
       versions_output: ${{ steps.Get_new_versions.outputs.TOOL_VERSIONS }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           submodules: true
 
@@ -45,7 +45,7 @@ jobs:
     env:
       TOOL_VERSIONS: ${{needs.find_new_versions.outputs.versions_output}}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           submodules: true
 
@@ -75,7 +75,7 @@ jobs:
       TOOL_VERSIONS: ${{needs.find_new_versions.outputs.versions_output}}
     environment: Get Available Tools Versions - Publishing Approval
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           submodules: true
 
@@ -95,7 +95,7 @@ jobs:
     needs: [find_new_versions, check_new_versions, trigger_builds]
     if: failure()
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           submodules: true