unique pdf name

Author: be-marc

.github/workflows/book-dev-weekly.yml

@@ -60,6 +60,6 @@ jobs:
       - name: Upload pdf book
         uses: actions/upload-artifact@v4
         with:
-          name: mlr3book-${{ github.run_id }}-${{ github.job }}
+          name: mlr3book-${{ github.run_id }}-${{ github.job }}-${{ matrix.config.dev-package }}
           path: book/_book/Applied-Machine-Learning-Using-mlr3-in-R.pdf
           retention-days: 1