[Fix #8035] Fix a false positive for Lint/DeprecatedOpenSSLConstant

[koic]

Fixes #8035.

This PR fixes the following false positive for Lint/DeprecatedOpenSSLConstant when using double quoted string argument.

% cat example.rb
OpenSSL::Cipher::AES256.new('cbc')
OpenSSL::Cipher::AES256.new("cbc")

% bundle exec rubocop --only Lint/DeprecatedOpenSSLConstant -a
(snip)

Offenses:

example.rb:1:1: W: [Corrected] Lint/DeprecatedOpenSSLConstant: Use
OpenSSL::Cipher.new('AES-256-cbc') instead of OpenSSL::Cipher::AES256.new('cbc').
OpenSSL::Cipher::AES256.new('cbc')
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
example.rb:2:1: W: [Corrected] Lint/DeprecatedOpenSSLConstant: Use
OpenSSL::Cipher.new('AES-256-"cbc"') instead of OpenSSL::Cipher::AES256.new("cbc").
OpenSSL::Cipher::AES256.new("cbc")
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

% cat example.rb
OpenSSL::Cipher.new('AES-256-cbc')
OpenSSL::Cipher.new('AES-256-"cbc"')

#8035 has another different false positive, which resolves as another PR.

---

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• Wrote good commit messages.
• Commit message starts with [Fix #issue-number] (if the related issue exists).
• Feature branch is up-to-date with master (if not - rebase it).
• Squashed related commits together.
• Added tests.
• Added an entry to the Changelog if the new code introduces user-observable changes. See changelog entry format.
• The PR relates to only one subject with a clear title and description in grammatically correct, complete sentences.
• Run bundle exec rake default. It executes all tests and RuboCop for itself, and generates the documentation.

[bbatsov]

Thanks!