Update alpine Docker tag to v3.18.4

Dockerfile

@@ -5,7 +5,7 @@ WORKDIR /usr/src/app
 # pre-copy/cache go.mod for pre-downloading dependencies and only redownloading them in subsequent builds if they change
 RUN CGO_ENABLED=0 go install github.com/adhocteam/[email protected]
 
-FROM alpine:3.18.2
+FROM alpine:3.18.4
 RUN apk add --no-cache bash
 
 COPY --from=builder /go/bin/script_exporter /usr/app/script-exporter