Update webrick requirement from 1.4.2 to 1.7.0

Updates the requirements on [webrick](https://github.com/ruby/webrick) to permit the latest version.
- [Release notes](https://github.com/ruby/webrick/releases)
- [Commits](ruby/webrick@v1.4.2...v1.7.0)

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

Gemfile

@@ -11,6 +11,6 @@ gem "rubocop", "~> 1.0"
 group :test do
   gem "coveralls", require: false
   # Until I find a way to introduce other MITM proxy
-  gem "webrick", "1.4.2"
+  gem "webrick", "1.7.0"
   gem "evil-proxy", "~> 0.2"
 end