Bump webmock from 3.3.0 to 3.4.0

Bumps [webmock](https://github.com/bblimke/webmock) from 3.3.0 to 3.4.0.
- [Release notes](https://github.com/bblimke/webmock/releases)
- [Changelog](https://github.com/bblimke/webmock/blob/master/CHANGELOG.md)
- [Commits](bblimke/webmock@v3.3.0...v3.4.0)

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

Gemfile.lock

@@ -376,7 +376,7 @@ GEM
       activemodel (>= 5.0)
       bindex (>= 0.4.0)
       railties (>= 5.0)
-    webmock (3.3.0)
+    webmock (3.4.0)
       addressable (>= 2.3.6)
       crack (>= 0.3.2)
       hashdiff