try to pin tox

Author: braingram

.github/workflows/ci.yml

@@ -38,6 +38,7 @@ jobs:
     needs: [pre-commit]
     uses: OpenAstronomy/github-actions-workflows/.github/workflows/tox.yml@v2
     with:
+      toxdeps: 'tox<4.42'
       submodules: false
       # Any env name which does not start with `pyXY` will use this Python version.
       default_python: '3.10'