Bump actions/checkout from 4.2.0 to 4.2.1

Bumps [actions/checkout](https://github.com/actions/checkout) from 4.2.0 to 4.2.1.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v4.2.0...v4.2.1)

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

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

Author: dependabot[bot]

.github/workflows/ci.yaml

@@ -34,7 +34,7 @@ jobs:
         run: echo $CONDA/bin >> $GITHUB_PATH
 
       - name: Checkout repo
-        uses: actions/checkout@v4.2.0
+        uses: actions/checkout@v4.2.1
         with:
           fetch-depth: 0
 
@@ -85,7 +85,7 @@ jobs:
         run: echo $CONDA/bin >> $GITHUB_PATH
 
       - name: Checkout repo
-        uses: actions/checkout@v4.2.0
+        uses: actions/checkout@v4.2.1
         with:
           fetch-depth: 0