CI: Trying to explicitly add coverage

--HG--
branch : default/0.4.3

Author: Michael McNeil Forbes

.github/workflows/tests.yaml

@@ -20,6 +20,7 @@ jobs:
         run: |
           python3.12 -m pip install --upgrade pip pipx
           python3.12 -m pipx install nox
+          python3.12 -m pipx install coverage
       - name: Test with pytest
         run: nox -p ${{ matrix.python-version }}
       - name: Coveralls Parallel

pyproject.toml

@@ -60,6 +60,7 @@ Changelog = "https://zopeext.readthedocs.io/en/latest/#changelog"
 [project.optional-dependencies]
 test = [
     'importlib-metadata>=4.8.3; python_version < "3.8"',
+    'typing_extensions<4.8.0; python_version < "3.8"',
     'pip>=22.2.1',
     'pytest-cov>=4.0.0',
     "sphinx-testing>=1.0.1",
@@ -107,3 +108,4 @@ doctest_optionflags = [
 [tool.coverage.run]
 # https://github.com/marketplace/actions/coveralls-python#coveragepy-configuration
 relative_files = true
+--format=cobertura