bump action

Author: jorisvandenbossche

.github/actions/run-tests/action.yml

@@ -7,7 +7,7 @@ runs:
       shell: bash -el {0}
 
     - name: Publish test results
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: Test results
         path: test-data.xml