chore(deps): update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/continuous-integration.yml

@@ -15,7 +15,7 @@ jobs:
         outputs:
             version: ${{ steps.supported-versions-matrix.outputs.version }}
         steps:
-            - uses: actions/checkout@v5
+            - uses: actions/checkout@v6
             - id: supported-versions-matrix
               uses: WyriHaximus/github-action-composer-php-versions-in-range@v1
     tests:
@@ -35,7 +35,7 @@ jobs:
                   git config --global core.eol lf
 
             - name: Checkout
-              uses: actions/checkout@v5
+              uses: actions/checkout@v6
 
             - name: Install Graphviz
               uses: kamiazya/setup-graphviz@v1

.github/workflows/release.yaml

@@ -15,7 +15,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v5.0.0
+        uses: actions/checkout@v6.0.1
         with:
           fetch-depth: 1