Upgrade codecov action to v5

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: cuppett

.github/workflows/ci.yml

@@ -101,6 +101,6 @@ jobs:
         run: |
           vendor/bin/phpunit --coverage-text --coverage-clover=coverage.xml
 
-      - uses: codecov/codecov-action@v4
+      - uses: codecov/codecov-action@v5
         with:
           fail_ci_if_error: false