Update actions/checkout action to v6 (#688)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/ci.yml

@@ -50,7 +50,7 @@ jobs:
         run: choco install fossil hg
 
       - name: Download source
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Build
         run: make -f ${{ runner.os == 'Windows' && 'Makefile.win' || 'Makefile' }}

.github/workflows/docs.yml

@@ -21,7 +21,7 @@ jobs:
     runs-on: ubuntu-24.04
     steps:
       - name: Download source
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Build manpages
         uses: Analog-inc/[email protected]
         with:

lib/molinillo/.github/workflows/crystal.yml

@@ -11,7 +11,7 @@ jobs:
       image: crystallang/crystal
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: Install dependencies
       run: shards install
     - name: Run tests