attempt to fix CI for pdf

Author: Mathieu Lobet

.github/workflows/courses.yml

@@ -14,7 +14,7 @@ jobs:
   changes:
     runs-on: ubuntu-latest
     outputs:
-      output1: ${{ steps.filter.outputs.workflows }}
+      output1: ${{ steps.filter.outputs.beginner }}
     steps:
     - uses: actions/checkout@v4
     - uses: dorny/paths-filter@v3