Bump actions/upload-artifact from 3 to 4 (#147)

Author: dependabot[bot]

.github/workflows/test.yml

@@ -39,7 +39,7 @@ jobs:
       run: tox run -f py$(echo ${{ matrix.python-version }} | tr -d .)
 
     - name: Upload coverage data
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: coverage-data
         path: '.coverage.*'
@@ -71,7 +71,7 @@ jobs:
 
       - name: Upload HTML report
         if: ${{ failure() }}
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: html-report
           path: htmlcov