Use PyTinyTeX instead in ci

Author: JessicaTegner

.github/workflows/ci.yaml

@@ -35,11 +35,10 @@ jobs:
           python-version: ${{ matrix.python-version }}
       - name: Print Python Information
         run: python -VV
-      - name: Specify tinytex mirror (CTAN_REPO)
+      - name: Install TinyTeX
         run: |
-          echo "CTAN_REPO=https://mirrors.dotsrc.org/ctan/" >> $GITHUB_ENV
-      - name: install TinyTeX
-        uses: r-lib/actions/setup-tinytex@v2
+          pip3 install -U pytinytex
+          python3 -c "import pytinytex; pytinytex.download_tinytex()"
       - name: Install and configure Poetry
         run: |
           pip3 install -U poetry setuptools