Update alpine:latest Docker digest to b97e2a8 (#109)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Dockerfile

@@ -15,7 +15,7 @@ COPY *.go ./
 RUN go build -o confluence-gardner
 
 # final stage
-FROM alpine:latest@sha256:21dc6063fd678b478f57c0e13f47560d0ea4eeba26dfc947b2a4f81f686b9f45
+FROM alpine:latest@sha256:b97e2a89d0b9e4011bb88c02ddf01c544b8c781acf1f4d559e7c8f12f1047ac3
 COPY --from=build-env /go/src/confluence-gardner/confluence-gardner  /usr/local/bin/confluence-gardner
 RUN mkdir -p /output
 ENV DIRECTORY /output