Lock tox to v3 in GitHub Action

.github/workflows/tests.yml

@@ -57,15 +57,15 @@ jobs:
           sudo apt-get install -y pyqt5-dev-tools xvfb jq
 
       - name: Setup Python ${{ matrix.python }}
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v4
         with:
           python-version: ${{ matrix.python }}
 
       - name: Install tox
-        run: pip install tox
+        run: pip install 'tox==3.28.0'
 
       - name: Checkout repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: Run tests
         run: tox -vvve ${{ matrix.environment }} -- --forked --verbose

tox-install-command

@@ -13,7 +13,7 @@ upload_time=$(curl https://pypi.org/pypi/anki/json \
             | jq --arg v "$version" -r '.releases[$v][0].upload_time_iso_8601')
 cutoff_time=$(date --utc -d "$upload_time +1 hour" '+%Y-%m-%dT%H:%M:%S')
 
-coproc SERVER { "$toxworkdir"/.tox/bin/python -um pypi_timemachine "$cutoff_time"; }
+coproc SERVER { "$toxworkdir"/bin/python -um pypi_timemachine "$cutoff_time"; }
 index_url=$(print_first_group '(http\S+)' <&"${SERVER[0]}")
 
 python -m pip install --index-url "$index_url" "anki==$version" "$AQT==$version"