Bump fsouza/fake-gcs-server in /docker/images/gcs-emulator (#85)

Bumps fsouza/fake-gcs-server from 1.50.2 to 1.52.1.

---
updated-dependencies:
- dependency-name: fsouza/fake-gcs-server
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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docker/images/gcs-emulator/Dockerfile

@@ -1,4 +1,4 @@
-FROM fsouza/fake-gcs-server:1.50.2@sha256:23996047676fe5312001b828d800670519181c57a5943c2270e7421f3ab3f477
+FROM fsouza/fake-gcs-server:1.52.1@sha256:2e67334d7fb6882c5efa85aa7c5912e5cad0b9e95eb6cfd14710604bf598a0a7
 
 # add curl for use in healthcheck
 RUN apk add --no-cache curl