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] <[email protected]>

.github/workflows/ci.yaml

@@ -15,7 +15,7 @@ jobs:
           EOF
 
       - name: Check out repository code
-        uses: actions/[email protected].0
+        uses: actions/[email protected].1
 
       - name: Install Golang
         uses: actions/[email protected]

.github/workflows/master-build.yaml

@@ -19,7 +19,7 @@ jobs:
           EOF
 
       - name: Check out repository code
-        uses: actions/[email protected].0
+        uses: actions/[email protected].1
 
       - name: Log in to GHCR.io
         uses: docker/[email protected]
@@ -60,7 +60,7 @@ jobs:
           EOF
 
       - name: Check out repository code
-        uses: actions/[email protected].0
+        uses: actions/[email protected].1
       - name: Log in to GHCR.io
         uses: docker/[email protected]
         with: