Add and apply Lint/RedundantSafeNavigation RuboCop rule

We've tested the updated behavior in RuboCop 1.69, found a new offense, and corrected it.

.rubocop.yml

@@ -311,6 +311,9 @@ Lint/NonAtomicFileOperation:
 Lint/ParenthesesAsGroupedExpression:
   Enabled: true
 
+Lint/RedundantSafeNavigation:
+  Enabled: true
+
 Lint/RedundantStringCoercion:
   Enabled: true
 

app/controllers/legislation/annotations_controller.rb

@@ -101,7 +101,7 @@ class Legislation::AnnotationsController < Legislation::BaseController
 
     def convert_ranges_parameters
       annotation = params[:legislation_annotation]
-      if annotation && annotation[:ranges]&.is_a?(String)
+      if annotation && annotation[:ranges].is_a?(String)
         params[:legislation_annotation][:ranges] = JSON.parse(annotation[:ranges])
       end
     rescue JSON::ParserError