Reduce timeout of the doc build to 60 minutes

There is no need to wait for 6 hours...

.github/workflows/doc-build.yml

@@ -28,6 +28,7 @@ jobs:
         run: sleep 30
   build-doc:
     name: "Documentation Build"
+    timeout-minutes: 60
     runs-on: ubuntu-latest
     # Skip main in forks
     if: "github.repository == 'quarkusio/quarkus' || !endsWith(github.ref, '/main')"