[BUG] [Ruby] `samples/client/petstore-security-test/ruby` contains syntax errors

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• What's the version of OpenAPI Generator used?
• Have you search for related issues/PRs?
• What's the actual output vs expected output?
• [Optional] Bounty to sponsor the fix (example)

Description

Generated Ruby client code in samples/client/petstore-security-test/ruby contains syntax errors.

openapi-generator version

$ java -jar modules/openapi-generator-cli/target/openapi-generator-cli.jar version
4.0.0-SNAPSHOT

$ git log --oneline -n 1
b6c2266a14 (HEAD -> master, origin/master, origin/HEAD) [Rust][Client] Code format (#2042)

OpenAPI declaration file content or url

N/A

Command line used for generation

$ cd samples/client/petstore-security-test/ruby
$ rubocop

Steps to reproduce

1. Run the above command to check syntax of samples.
2. Get errors:

   $ rubocop -f s
   == lib/petstore/configuration.rb ==
   E:220: 46: Lint/Syntax: unexpected token tEQL
   (Using Ruby 2.2 parser; configure using TargetRubyVersion parameter, under AllCops)
   E:220: 54: Lint/Syntax: bare backslash only allowed before newline
   (Using Ruby 2.2 parser; configure using TargetRubyVersion parameter, under AllCops)
   E:220: 56: Lint/Syntax: bare backslash only allowed before newline
   (Using Ruby 2.2 parser; configure using TargetRubyVersion parameter, under AllCops)
   E:220: 59: Lint/Syntax: bare backslash only allowed before newline
   (Using Ruby 2.2 parser; configure using TargetRubyVersion parameter, under AllCops)
   E:220: 62: Lint/Syntax: bare backslash only allowed before newline
   (Using Ruby 2.2 parser; configure using TargetRubyVersion parameter, under AllCops)
   W:220: 68: Lint/Syntax: *' interpreted as argument prefix
   (Using Ruby 2.2 parser; configure using TargetRubyVersion parameter, under AllCops`)
   F:220: 69: Lint/Syntax: unterminated string meets end of file
   (Using Ruby 2.2 parser; configure using TargetRubyVersion parameter, under AllCops)
   
   15 files inspected, 7 offenses detected
   

Related issues/PRs

#2101

Suggest a fix

The cause is here.
I think that the embedded URL must be escaped.

Start with samples/client/petstore-security-test/ruby/lib/petstore/configuration.rb at the reported line 220 and review related issue #2101. Run rubocop in samples/client/petstore-security-test/ruby to reproduce the syntax errors. Done means the generated Ruby sample passes the syntax checks without the reported offenses.