Bump webmock from 3.19.1 to 3.20.0

Bumps [webmock](https://github.com/bblimke/webmock) from 3.19.1 to 3.20.0.
- [Changelog](https://github.com/bblimke/webmock/blob/master/CHANGELOG.md)
- [Commits](https://github.com/bblimke/webmock/compare/v3.19.1...v3.20.0)

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

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

Gemfile.lock

@@ -435,7 +435,8 @@ GEM
     concurrent-ruby (1.2.3)
     connection_pool (2.4.1)
     cookiejar (0.3.4)
-    crack (0.4.5)
+    crack (0.4.6)
+      bigdecimal
       rexml
     crass (1.0.6)
     css_parser (1.16.0)
@@ -1098,7 +1099,7 @@ GEM
       activesupport
       faraday (~> 2.0)
       faraday-follow_redirects
-    webmock (3.19.1)
+    webmock (3.20.0)
       addressable (>= 2.8.0)
       crack (>= 0.3.2)
       hashdiff (>= 0.4.0, < 2.0.0)