Bump webmock from 3.7.6 to 3.8.0 (#1528)

Bumps [webmock](https://github.com/bblimke/webmock) from 3.7.6 to 3.8.0.
- [Release notes](https://github.com/bblimke/webmock/releases)
- [Changelog](https://github.com/bblimke/webmock/blob/master/CHANGELOG.md)
- [Commits](bblimke/webmock@v3.7.6...v3.8.0)

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

Gemfile.lock

@@ -158,7 +158,7 @@ GEM
       method_source (~> 0.9.0)
     pry-rails (0.3.9)
       pry (>= 0.10.4)
-    public_suffix (4.0.1)
+    public_suffix (4.0.3)
     pundit (2.1.0)
       activesupport (>= 3.0.0)
     rack (2.1.1)
@@ -236,7 +236,7 @@ GEM
     unicorn (5.5.2)
       kgio (~> 2.6)
       raindrops (~> 0.7)
-    webmock (3.7.6)
+    webmock (3.8.0)
       addressable (>= 2.3.6)
       crack (>= 0.3.2)
       hashdiff (>= 0.4.0, < 2.0.0)