updated codecov action version

Author: daveshanley

.github/workflows/build.yaml

@@ -40,7 +40,7 @@ jobs:
       - run: |
           go test -v -coverprofile cover.out ./...
           gocov convert cover.out | gocov-xml > coverage.xml
-      - uses: codecov/codecov-action@v3
+      - uses: codecov/codecov-action@v4
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
           files: ./coverage.xml