Merge pull request #6 from nikdoof/renovate/alpine-3.x

Update dependency alpine to v3.15.4

Dockerfile

@@ -4,7 +4,7 @@ COPY . .
 RUN go get -d -v .
 RUN go build -v ./cmd/aaisp_exporter
 
-FROM alpine:3.15.0
+FROM alpine:3.15.4
 WORKDIR /service
 COPY --from=build /build/aaisp_exporter .
 ENTRYPOINT ["./aaisp_exporter"]%