Didn't take v4 breaking changes into account.

Author: KyeRussell

.github/workflows/test.yml

@@ -46,7 +46,7 @@ jobs:
     - name: Upload coverage data
       uses: actions/upload-artifact@v4
       with:
-        name: coverage-data
+        name: coverage-data-${{ matrix.python-version }}
         path: '.coverage.*'
         if-no-files-found: error
         retention-days: 1
@@ -67,9 +67,10 @@ jobs:
         run: python -m pip install --upgrade coverage[toml]
 
       - name: Download data
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
-          name: coverage-data
+          pattern: 'coverage-data-*'
+          merge-multiple: true
 
       - name: Fail if coverage is <100%
         run: |