Style/FetchEnvVar - false positive cases with (not) equal operators

[deepj]

Expected behavior

No issue while using ENVs and (not) equal operators

if ENV['DISABLE_DOTENV'] != '1'
  # Some Ruby code
end

Actual behavior

Style/FetchEnvVar: Use ENV.fetch('DISABLE_DOTENV') or ENV.fetch('DISABLE_DOTENV', nil) instead of ENV['DISABLE_DOTENV'].
if ENV['DISABLE_DOTENV'] != '1'
   ^^^^^^^^^^^^^^^^^^^^^

Steps to reproduce the problem

Code snippet

if ENV['DISABLE_DOTENV'] != '1'
  # Some Ruby code
end

Run

rubocop --only Style/FetchEnvVar

RuboCop version

$ rubocop -V
1.28.2 (using Parser 3.1.2.0, rubocop-ast 1.17.0, running on ruby 3.1.2 arm64-darwin21)
  - rubocop-performance 1.13.3
  - rubocop-rails 2.14.2