update upload artifact action to v4

Author: LGro

.github/workflows/python.yaml

@@ -52,7 +52,7 @@ jobs:
         env:
           COVERAGE_FILE: ".coverage.${{ matrix.python-version }}"
       - name: Store coverage file
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: coverage
           path: .coverage.${{ matrix.python-version }}
@@ -81,7 +81,7 @@ jobs:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           MERGE_COVERAGE_FILES: true
       - 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