Cap tox version in CI

Author: domdfcoding

.github/workflows/flake8.yml

@@ -43,7 +43,7 @@ jobs:
           python -VV
           python -m site
           python -m pip install --upgrade pip setuptools wheel
-          python -m pip install tox
+          python -m pip install tox~=3.0
 
       - name: "Run Flake8"
         if: steps.changes.outputs.code == 'true'

.github/workflows/mypy.yml

@@ -47,7 +47,7 @@ jobs:
           python -VV
           python -m site
           python -m pip install --upgrade pip setuptools wheel
-          python -m pip install --upgrade tox virtualenv!=20.16.0
+          python -m pip install --upgrade tox~=3.0 virtualenv!=20.16.0
 
       - name: "Run mypy"
         if: steps.changes.outputs.code == 'true'

.github/workflows/python_ci.yml

@@ -65,7 +65,7 @@ jobs:
           python -VV
           python -m site
           python -m pip install --upgrade pip setuptools wheel
-          python -m pip install --upgrade tox virtualenv!=20.16.0
+          python -m pip install --upgrade tox~=3.0 virtualenv!=20.16.0
 
       - name: "Run Tests for Python ${{ matrix.config.python-version }}"
         if: steps.setup-python.outcome == 'success'

.github/workflows/python_ci_linux.yml

@@ -148,7 +148,7 @@ jobs:
         if: startsWith(github.ref, 'refs/tags/')
         run: |
           python -m pip install --upgrade pip setuptools wheel
-          python -m pip install --upgrade tox
+          python -m pip install --upgrade tox~=3.0
 
       - name: Build distributions 📦
         if: startsWith(github.ref, 'refs/tags/')

.github/workflows/python_ci_macos.yml

@@ -64,7 +64,7 @@ jobs:
           python -VV
           python -m site
           python -m pip install --upgrade pip setuptools wheel
-          python -m pip install --upgrade tox virtualenv!=20.16.0
+          python -m pip install --upgrade tox~=3.0 virtualenv!=20.16.0
 
       - name: "Run Tests for Python ${{ matrix.config.python-version }}"
         if: steps.setup-python.outcome == 'success'

tox.ini

@@ -33,6 +33,7 @@ isolated_build = True
 requires =
     pip>=21,!=22.2
     tox-envlist>=0.2.1
+    tox~=3.0
     virtualenv!=20.16.0
 
 [envlists]