Build(deps-dev): Bump webmock from 3.5.1 to 3.7.6 (#8512)

Bumps [webmock](https://github.com/bblimke/webmock) from 3.5.1 to 3.7.6.
- [Release notes](https://github.com/bblimke/webmock/releases)
- [Changelog](https://github.com/bblimke/webmock/blob/master/CHANGELOG.md)
- [Commits](https://github.com/bblimke/webmock/compare/v3.5.1...v3.7.6)

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

Gemfile.lock

@@ -140,7 +140,7 @@ GEM
     globalid (0.4.2)
       activesupport (>= 4.2.0)
     guess_html_encoding (0.0.11)
-    hashdiff (0.3.9)
+    hashdiff (1.0.0)
     hashie (3.6.0)
     highline (1.7.10)
     hkdf (0.3.0)
@@ -415,10 +415,10 @@ GEM
       kgio (~> 2.6)
       raindrops (~> 0.7)
     uniform_notifier (1.13.0)
-    webmock (3.5.1)
+    webmock (3.7.6)
       addressable (>= 2.3.6)
       crack (>= 0.3.2)
-      hashdiff
+      hashdiff (>= 0.4.0, < 2.0.0)
     webpush (0.3.8)
       hkdf (~> 0.2)
       jwt (~> 2.0)