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

Author: renovate[bot]

.github/workflows/build-and-publish.yaml

@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Tests
         uses: ./.github/workflows/tests

.github/workflows/pull-request.yaml

@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Tests
         uses: ./.github/workflows/tests

.github/workflows/update-repo-info.yaml

@@ -17,7 +17,7 @@ jobs:
     runs-on: ubuntu-24.04
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Sync repository description
         run: