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](actions/checkout@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]>

Author: dependabot[bot]

.github/workflows/build_workflow.yml

@@ -37,7 +37,7 @@ jobs:
           paths_ignore: ${{ env.PATHS_IGNORE }}
 
       - if: ${{ steps.skip_check.outputs.should_skip != 'true' }}
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - if: ${{ steps.skip_check.outputs.should_skip != 'true' }}
         name: Cache Conda

.github/workflows/docs_workflow.yml

@@ -20,7 +20,7 @@ jobs:
         shell: bash -l {0}
     timeout-minutes: 20
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           persist-credentials: false
           fetch-depth: 0