ci: update codecov-action

Author: masonkatz

.github/workflows/test.yaml

@@ -27,7 +27,7 @@ jobs:
         with:
           go-version: 1.24
       - run: go test -v ./... -coverprofile=coverage.txt -covermode=count
-      - uses: codecov/codecov-action@v3
+      - uses: codecov/codecov-action@v5
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
           verbose: true