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

Author: renovate[bot]

.github/workflows/ci.yml

@@ -15,7 +15,7 @@ jobs:
       - name: Run coverage
         run: go env -w GOTOOLCHAIN=go1.25.0+auto && go test -coverpkg=./... ./... -race -coverprofile=coverage.out -covermode=atomic
       - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@v5
+        uses: codecov/codecov-action@v6
         with:
           verbose: true
         env: