Update alpine Docker tag to v3.21.0

Dockerfile

@@ -4,7 +4,7 @@ COPY . .
 RUN go get -d -v .
 RUN go build -v ./cmd/aaisp_exporter
 
-FROM alpine:3.17.2
+FROM alpine:3.21.0
 WORKDIR /service
 COPY --from=build /build/aaisp_exporter .
 ENTRYPOINT ["./aaisp_exporter"]

go.mod

@@ -3,6 +3,6 @@ module github.com/jamesog/aaisp-chaos
 go 1.13
 
 require (
-	github.com/prometheus/client_golang v1.20.5
+	github.com/prometheus/client_golang v1.14.0
 	github.com/rs/zerolog v1.27.0
 )