Bump actions/checkout from 4.1.1 to 4.1.6

Bumps [actions/checkout](https://github.com/actions/checkout) from 4.1.1 to 4.1.6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v4.1.1...v4.1.6)

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

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

.github/workflows/ci.yml

@@ -187,7 +187,7 @@ jobs:
 
       - name: Checkout the project source
         if: ${{ !steps.check_cache.outputs.cache-hit }}
-        uses: actions/checkout@v4.1.1
+        uses: actions/checkout@v4.1.6
 
       - name: Build the Guix shell environment
         if: ${{ !steps.check_cache.outputs.cache-hit }}
@@ -318,7 +318,7 @@ jobs:
         run: test -z "$(guix --version 2>&1 >/dev/null)"
 
       - name: Checkout the project source
-        uses: actions/checkout@v4.1.1
+        uses: actions/checkout@v4.1.6
         with:
           path: guix-qmk
 
@@ -327,7 +327,7 @@ jobs:
         run: guix shell -r ~/.cache/manifest-gcroot -m manifest.scm -- true
 
       - name: Checkout the QMK firmware source code
-        uses: actions/checkout@v4.1.1
+        uses: actions/checkout@v4.1.6
         with:
           path: qmk_firmware
           repository: ${{ matrix.source.repo }}