tox 4.x compatibility

Author: asottile

.github/workflows/deploy.yml

@@ -7,9 +7,11 @@ jobs:
   pr:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v1
-    - uses: actions/setup-python@v1
-    - run: pip install 'tox<4'
+    - uses: actions/checkout@v3
+    - uses: actions/setup-python@v4
+      with:
+        python-version: 3.x
+    - run: pip install tox
     - run: tox -e push
       env:
         GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}

tox.ini

@@ -19,10 +19,12 @@ deps = pre-commit
 commands = pre-commit run --all-files --show-diff-on-failure
 
 [testenv:push]
-passenv = GITHUB_* GH_TOKEN
+passenv =
+    GITHUB_*
+    GH_TOKEN
 commands =
     {[testenv]commands}
-    {toxinidir}/testing/make-index
+    python {toxinidir}/testing/make-index
     markdown-to-presentation push index.html demo
 
 [pep8]