fix: backend/Dockerfile.viewercontroller to reduce vulnerabilities

Author: snyk-bot

backend/Dockerfile.viewercontroller

@@ -30,7 +30,7 @@ COPY . .
 
 RUN GO111MODULE=on go build -o /bin/controller backend/src/crd/controller/viewer/*.go
 
-FROM alpine
+FROM alpine:3.23.3
 WORKDIR /bin
 
 COPY --from=builder /bin/controller /bin/controller