chore(deps): update codecov/codecov-action action to v6

Author: renovate[bot]

.github/workflows/tests.yml

@@ -64,7 +64,7 @@ jobs:
       - name: Run tests
         run: pnpm test:unit
       - name: Collect coverage
-        uses: codecov/codecov-action@v5
+        uses: codecov/codecov-action@v6
         if: success()
         with:
           files: ./coverage/lcov.info