Bump pusher from 2.0.0 to 2.0.1 (#13144)

Bumps [pusher](https://github.com/pusher/pusher-http-ruby) from 2.0.0 to 2.0.1.
- [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/2.0.0...2.0.1)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Gemfile.lock

@@ -539,7 +539,7 @@ GEM
       activesupport (>= 3.0.0)
     pundit-matchers (1.6.0)
       rspec-rails (>= 3.0.0)
-    pusher (2.0.0)
+    pusher (2.0.1)
       httpclient (~> 2.8)
       multi_json (~> 1.15)
       pusher-signature (~> 0.1.8)