Update lock files and CI workflow to support tox version

Author: noirbizarre

.github/workflows/ci.yml

@@ -11,7 +11,7 @@ jobs:
     strategy:
       matrix:
         python-version: [3.8, 3.9, "3.10"]
-        tox-version: ["<4", ">=4.0.0b0"]
+        tox-version: [3, 4]
 
     steps:
       - uses: actions/checkout@v3
@@ -21,12 +21,13 @@ jobs:
           python-version: ${{ matrix.python-version }}
       - name: Install dependencies
         run: |
-          python -m pip install "tox${{ matrix.tox-version }}" .
+          python -m pip install "tox>=${{ matrix.tox-version }}.0.0b0,<${{ matrix.tox-version }}.999" .
       - name: Test with tox
         run: |
+          tox --version
           pyversion="${{ matrix.python-version }}"
-          if which tox4 > /dev/null
-          then
-            mv pdm.tox4.lock pdm.lock
+          toxversion="${{ matrix.tox-version }}"
+          if [[ $toxversion == "4" ]]; then
+            mv pdm.tox4.lock pdm.lock;
           fi
-          tox -e py${pyversion/./}
+          tox -e py${pyversion/./}-tox${toxversion}