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

.gitea/workflows/build.yml

@@ -12,7 +12,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3

.gitea/workflows/renovate.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     container: git.fossy.my.id/renovate-clanker/renovate:latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - run: renovate
         env:
           RENOVATE_CONFIG_FILE: ${{ gitea.workspace }}/renovate-config.js

.github/workflows/sync-to-gitea.yml

@@ -14,7 +14,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0