Use tox-gh-actions branch

Author: effigies

.github/workflows/test.yml

@@ -208,7 +208,7 @@ jobs:
         run: python -c "import sys; print(sys.version)"
       - name: Install tox
         run: |
-          uv tool install tox --with=tox-gh-actions --with=tox-uv
+          uv tool install tox --with=git+https://github.com/effigies/tox-gh-actions@abiflags --with=tox-uv
         env:
           UV_PYTHON: ${{ matrix.python-version }}
       - name: Show tox config