Update alpine:latest Docker digest to c5b1261

Dockerfile

@@ -15,7 +15,7 @@ COPY *.go ./
 RUN go build -o confluence-gardner
 
 # final stage
-FROM alpine:latest@sha256:51b67269f354137895d43f3b3d810bfacd3945438e94dc5ac55fdac340352f48
+FROM alpine:latest@sha256:c5b1261d6d3e43071626931fc004f70149baeba2c8ec672bd4f27761f8e1ad6b
 COPY --from=build-env /go/src/confluence-gardner/confluence-gardner  /usr/local/bin/confluence-gardner
 RUN mkdir -p /output
 ENV DIRECTORY /output