Update golang Docker tag to v1.21

renovate[bot] · g3force · commit 2bf2c7e00558 · 2023-12-02T18:49:56.000+01:00
diff --git a/Dockerfile b/Dockerfile
@@ -4,7 +4,7 @@ WORKDIR frontend
 RUN npm install
 RUN npm run build
 
-FROM golang:1.20-alpine AS build_go
+FROM golang:1.21-alpine AS build_go
 ARG cmd=ssl-remote-control
 WORKDIR work
 COPY . .
