chore(deps): update codecov/codecov-action action to v3 (element-plus#7097)

Co-authored-by: Renovate Bot <bot@renovateapp.com>

Author: renovate[bot]

.github/workflows/test-unit.yml

@@ -48,6 +48,6 @@ jobs:
       - name: Test
         run: pnpm test:jest && pnpm test:coverage
       - name: Upload to codecov.io
-        uses: codecov/codecov-action@v2
+        uses: codecov/codecov-action@v3
         with:
           fail_ci_if_error: true