chore(deps-dev): bump webmock in /fluent-plugin-events (#621)

Bumps [webmock](https://github.com/bblimke/webmock) from 3.22.0 to 3.23.0.
- [Changelog](https://github.com/bblimke/webmock/blob/master/CHANGELOG.md)
- [Commits](bblimke/webmock@v3.22.0...v3.23.0)

---
updated-dependencies:
- dependency-name: webmock
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

fluent-plugin-events/Gemfile.lock

@@ -108,7 +108,7 @@ GEM
     unf (0.1.4)
       unf_ext
     unf_ext (0.0.8.2)
-    webmock (3.22.0)
+    webmock (3.23.0)
       addressable (>= 2.8.0)
       crack (>= 0.3.2)
       hashdiff (>= 0.4.0, < 2.0.0)