chore(deps): update alpine docker tag to v3.14 (#87)

Author: renovate[bot]

Dockerfile

@@ -5,7 +5,7 @@ ADD . /app
 WORKDIR /app
 RUN go build -ldflags "-w -s" -o /sx
 
-FROM alpine:3.13
+FROM alpine:3.14
 
 RUN apk add libpcap
 COPY --from=builder /sx /sx