Bump webmock from 3.21.2 to 3.22.0 (thoughtbot#2531)

Bumps [webmock](https://github.com/bblimke/webmock) from 3.21.2 to 3.22.0.
- [Changelog](https://github.com/bblimke/webmock/blob/master/CHANGELOG.md)
- [Commits](bblimke/webmock@v3.21.2...v3.22.0)

---
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>

Gemfile.lock

@@ -343,7 +343,7 @@ GEM
     unicorn (6.1.0)
       kgio (~> 2.6)
       raindrops (~> 0.7)
-    webmock (3.21.2)
+    webmock (3.22.0)
       addressable (>= 2.8.0)
       crack (>= 0.3.2)
       hashdiff (>= 0.4.0, < 2.0.0)