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

[koic]

Fixes #8035.

This PR fixes a false positive for Lint/DeprecatedOpenSSLConstant when argument is a variable, method, or constant.

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

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

Offenses:

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

1 file inspected, 1 offense detected, 1 offense corrected

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

RuboCop does not have a tracing feature a value of variable, (method,) and constant yet.
This PR accepts cases where these values are used to prevent auto-correction mistakes.

On the other hand, this change produces false negatives for the deprecated APIs.
If it is difficult to accept false negatives, I will update this PR to warn against these cases and auto-correction will not performed.

---

Before submitting the PR make sure the following are checked:

• 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!