Merge pull request #1826 from dandi/dependabot/github_actions/codecov/codecov-action-6

[gh-actions](deps): Bump codecov/codecov-action from 5 to 6

Author: yarikoptic

.github/workflows/run-tests.yml

@@ -178,7 +178,7 @@ jobs:
           down -v
 
     - name: Upload coverage to Codecov
-      uses: codecov/codecov-action@v5
+      uses: codecov/codecov-action@v6
       with:
         token: ${{ secrets.CODECOV_TOKEN }}
         files: ./coverage.xml