build(deps): bump alpine from 3.15.1 to 3.15.2 (#727)

Bumps alpine from 3.15.1 to 3.15.2.

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

Dockerfile

@@ -10,7 +10,7 @@ ADD . ./
 ENV CGO_ENABLED=0
 RUN go build -o fake-gcs-server
 
-FROM alpine:3.15.1
+FROM alpine:3.15.2
 RUN apk add --no-cache mailcap
 COPY --from=builder /code/fake-gcs-server /bin/fake-gcs-server
 RUN /bin/fake-gcs-server -h