fix deprecated mamba setup in pytest workflow

Author: tlpss

.github/workflows/pytest.yml

@@ -14,7 +14,7 @@ jobs:
         run: |
           sudo apt-get install fonts-freefont-ttf
       - name: install conda env with micromamba
-        uses: mamba-org/provision-with-micromamba@main
+      - uses: mamba-org/setup-micromamba@v2
         with:
           channel-priority: strict
           environment-file: environment.yaml