Start using uv instead of pip

.config/requirements-test.in

@@ -2,3 +2,4 @@ coverage-enable-subprocess # see https://github.com/nedbat/coveragepy/issues/134
 coverage[toml] >= 6.4.4
 pytest >= 7.2.2
 pytest-xdist >= 2.1.0
+uv

.github/workflows/tox.yml

@@ -52,7 +52,7 @@ jobs:
           cache-dependency-path: .config/requirements*.in
           cache: pip
           python-version: ${{ matrix.python_version }}
-      - run: pip3 install -U tox
+      - run: python3 -m pip install -U uv tox tox-uv
       - run: "${{ matrix.command }}"
   codeql:
     name: codeql

tox.ini

@@ -1,13 +1,15 @@
 # spell-checker:ignore linkcheck basepython changedir envdir envlist envname envsitepackagesdir passenv setenv testenv toxinidir toxworkdir usedevelop doctrees envpython posargs minversion showlocals REQPASS PYTHONPYCACHEPREFIX PYTHONIOENCODING PYTHONBREAKPOINT
 [tox]
-minversion = 4.6.3
+minversion = 4.21.2
 envlist =
   lint
   py
 isolated_build = true
 skip_missing_interpreters = True
 requires =
-  tox >= 4.6.3
+  tox >= 4.21.2
+  tox-extra >= 2.0.2
+  tox-uv >= 1.15.0
   setuptools >= 65.3.0 # editable installs
 
 [testenv]
@@ -18,7 +20,7 @@ extras =
 commands_pre =
   sh -c "rm -f {envdir}/.coverage.* 2>/dev/null || true"
   # safety measure to assure we do not accidentally run tests with broken dependencies
-  {envpython} -m pip check
+  uv pip check
 commands =
   coverage run -m pytest {posargs:\
     -v \