Apply updates from cookiecutter

This automated commit applies the latest updates from our cookiecutters [1] to
this repo.

[1]: https://github.com/hypothesis/cookiecutters

.github/workflows/ci.yml

@@ -94,7 +94,7 @@ jobs:
         env:
           COVERAGE_FILE: .coverage.${{ matrix.python-version }}
       - name: Upload coverage file
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: coverage
           path: .coverage.*
@@ -116,7 +116,7 @@ jobs:
           restore-keys: |
             coverage-${{ runner.os }}-tox-
       - name: Download coverage files
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: coverage
       - run: python -m pip install 'tox<4'