chore: update codecov/codecov-action action to v6

Author: renovate[bot]

.github/workflows/ci.yml

@@ -59,7 +59,7 @@ jobs:
         run: |
           go test -v -gcflags=all=-l -cover ./... -coverprofile coverage.out -coverpkg ./...
       - name: Upload code coverage report
-        uses: codecov/codecov-action@1af58845a975a7985b0beb0cbe6fbbb71a41dbad # v5.5.3
+        uses: codecov/codecov-action@57e3a136b779b570ffcdbf80b3bdc90e7fab3de2 # v6
         with:
           files: coverage.out
           verbose: true