Bump pusher from 1.4.2 to 1.4.3 (#11208)

* Bump pusher from 1.4.2 to 1.4.3

Bumps [pusher](https://github.com/pusher/pusher-http-ruby) from 1.4.2 to 1.4.3.
- [Release notes](https://github.com/pusher/pusher-http-ruby/releases)
- [Changelog](https://github.com/pusher/pusher-http-ruby/blob/master/CHANGELOG.md)
- [Commits](https://github.com/pusher/pusher-http-ruby/compare/v1.4.2...v1.4.3)

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

* Bump pusher from 1.4.2 to 1.4.3 (Update vendor/cache)

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Gemfile.lock

@@ -529,7 +529,7 @@ GEM
       activesupport (>= 3.0.0)
     pundit-matchers (1.6.0)
       rspec-rails (>= 3.0.0)
-    pusher (1.4.2)
+    pusher (1.4.3)
       httpclient (~> 2.8)
       multi_json (~> 1.15)
       pusher-signature (~> 0.1.8)