Use supported checkout action in Gitea workflows

.gitea/workflows/release.yml

@@ -52,7 +52,7 @@ jobs:
     needs: version
     runs-on: windows-latest
     steps:
-      - uses: builtin:checkout
+      - uses: actions/checkout@v5
       - name: Verify Windows runner
         shell: pwsh
         run: |
@@ -116,7 +116,7 @@ jobs:
     needs: version
     runs-on: ubuntu-latest
     steps:
-      - uses: builtin:checkout
+      - uses: actions/checkout@v5
       - name: Verify container runner
         run: |
           test "$(uname -s)" = Linux