update gh-actions artifacts to v4

Author: mastoffel

.github/workflows/ci.yaml

@@ -84,7 +84,7 @@ jobs:
 
 
       - name: Store coverage file
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: coverage
           path: .coverage.${{ matrix.python-version }}
@@ -104,7 +104,7 @@ jobs:
         uses: actions/checkout@v3
 
       - name: Download coverage artifact
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: coverage
 
@@ -118,7 +118,7 @@ jobs:
 
       # Store comment to be posted if written
       - name: Store Pull Request comment to be posted
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         if: steps.coverage_comment.outputs.COMMENT_FILE_WRITTEN == 'true'
         with:
           name: python-coverage-comment-action