Update actions/checkout action to v6

.gitea/workflows/release-image.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-js
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Login to Registry
         uses: docker/login-action@v3

.gitea/workflows/renovate.yaml

@@ -16,7 +16,7 @@ jobs:
     container: ghcr.io/renovatebot/renovate:42
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Renovate
         run: renovate

.gitea/workflows/test-build.yaml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-js
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Set up pnpm
         uses: pnpm/action-setup@v4