Bump websocket-extensions in /spec/integration/rails_6.0.2.1 (#813)

Bumps [websocket-extensions](https://github.com/faye/websocket-extensions-ruby) from 0.1.4 to 0.1.5.
- [Release notes](https://github.com/faye/websocket-extensions-ruby/releases)
- [Changelog](https://github.com/faye/websocket-extensions-ruby/blob/master/CHANGELOG.md)
- [Commits](faye/websocket-extensions-ruby@0.1.4...0.1.5)

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Author: dependabot[bot]

spec/integration/rails_6.0.2.1/Gemfile.lock

@@ -174,7 +174,7 @@ GEM
       selenium-webdriver (>= 3.0, < 4.0)
     websocket-driver (0.7.1)
       websocket-extensions (>= 0.1.0)
-    websocket-extensions (0.1.4)
+    websocket-extensions (0.1.5)
     xpath (3.2.0)
       nokogiri (~> 1.8)
     zeitwerk (2.2.2)