CI: use dokkaGenerate task of root project

As triggering it for all projects would do extra work

Author: freya022

.github/workflows/docs.yml

@@ -31,7 +31,7 @@ jobs:
           cache-read-only: true
 
       - name: Generate KDocs
-        run: ./gradlew dokkaGenerate
+        run: ./gradlew :dokkaGenerate
 
       - name: Upload artifact
         uses: actions/upload-pages-artifact@v4

.github/workflows/validate.yml

@@ -34,7 +34,7 @@ jobs:
       - name: Build KDocs
         # Run even if tests failed, but only on PRs
         if: ${{ !cancelled() && github.event_name == 'pull_request' }}
-        run: ./gradlew dokkaGenerate
+        run: ./gradlew :dokkaGenerate
 
       - name: Publish snapshot
         # Workflow dispatch, push or pull request from the original repo