Update rubocop requirement from ~> 1.76.1 to ~> 1.77.0 (#316)

* Update rubocop requirement from ~> 1.76.1 to ~> 1.77.0

Updates the requirements on [rubocop](https://github.com/rubocop/rubocop) to permit the latest version.
- [Release notes](https://github.com/rubocop/rubocop/releases)
- [Changelog](https://github.com/rubocop/rubocop/blob/master/CHANGELOG.md)
- [Commits](rubocop/rubocop@v1.76.1...v1.77.0)

---
updated-dependencies:
- dependency-name: rubocop
  dependency-version: 1.77.0
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <[email protected]>

* Fix lint

---------

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: なつき <[email protected]>

Author: dependabot[bot]

Gemfile

@@ -7,7 +7,7 @@ gemspec
 group :development do
   gem 'rake', '>= 13'
   gem 'rspec', '~> 3.13.0'
-  gem 'rubocop', '~> 1.76.1'
+  gem 'rubocop', '~> 1.77.0'
   gem 'rubocop-performance', '~> 1.25.0'
   gem 'rubocop-rake', '~> 0.7.1'
   gem 'rubocop-rspec', '~> 3.6.0'

lib/sass/value/color.rb

@@ -421,9 +421,9 @@ def _to_space(space)
       def _in_gamut?
         return true unless _space.bounded?
 
-        _is_channel_in_gamut(channel0, _space.channels[0]) &&
-          _is_channel_in_gamut(channel1, _space.channels[1]) &&
-          _is_channel_in_gamut(channel2, _space.channels[2])
+        _is_channel_in_gamut?(channel0, _space.channels[0]) &&
+          _is_channel_in_gamut?(channel1, _space.channels[1]) &&
+          _is_channel_in_gamut?(channel2, _space.channels[2])
       end
 
       def _to_gamut(method)
@@ -485,7 +485,7 @@ def _normalize_hue(hue, invert:)
         ((hue % 360) + 360 + (invert ? 180 : 0)) % 360
       end
 
-      def _is_channel_in_gamut(value, channel)
+      def _is_channel_in_gamut?(value, channel)
         case channel
         when LinearChannel
           FuzzyMath.less_than_or_equals?(value, channel.max) && FuzzyMath.greater_than_or_equals?(value, channel.min)