chore(docker): bump wiremock/wiremock

Bumps wiremock/wiremock from 3.12.0-1-alpine to 3.12.1-1-alpine.

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

Signed-off-by: dependabot[bot] <support@github.com>

wiremock.Dockerfile

@@ -1 +1 @@
-FROM wiremock/wiremock:3.12.0-1-alpine
+FROM wiremock/wiremock:3.12.1-1-alpine