Fix Github Actions CI

Author: dokempf

.github/workflows/paper.yml

@@ -32,6 +32,7 @@ jobs:
       - uses: xu-cheng/latex-action@v3
         with:
           root_file: paper.tex
+          extra_system_packages: texmf-dist-latexextra
 
       - name: move
         run: mkdir -p github_artifacts && mv ${{ env.DIR }}/*.pdf ./github_artifacts/