Bump alpine from 3.15 to 3.16.3

Bumps alpine from 3.15 to 3.16.3.

---
updated-dependencies:
- dependency-name: alpine
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Dockerfile

@@ -3,7 +3,7 @@ ADD ./modbus_exporter /go/modbus_exporter
 WORKDIR /go/modbus_exporter
 RUN go build
 
-FROM alpine:3.15
+FROM alpine:3.16.3
 WORKDIR /app
 COPY --from=builder /go/modbus_exporter/modbus_exporter .
 ENTRYPOINT ["./modbus_exporter"]