Update Docker image versions

Dockerfile

@@ -1,5 +1,5 @@
 # --- builder ---
-FROM golang:1.20.6-alpine3.17 as builder
+FROM golang:1.22-alpine3.20 as builder
 LABEL stage=builder
 RUN apk add git
 WORKDIR /build
@@ -12,7 +12,7 @@ ARG BUILD_STRING=pretendo.ssfiv.docker
 RUN go build -ldflags "-X 'main.serverBuildString=${BUILD_STRING}'" -v -o server
 
 # --- runner ---
-FROM alpine:3.17 as runner
+FROM alpine:3.20 as runner
 WORKDIR /build
 
 COPY --from=builder /build/server /build/