Fix test issue on Ruby 3.4+

Author: Fryguy

spec/core_ext/string/to_i_with_method_spec.rb

@@ -33,7 +33,7 @@
   end
 
   it 'raises NoMethodError on private methods' do
-    expect { "1.raise".to_i_with_method }.to raise_error(NoMethodError, /private method `raise' called/)
+    expect { "1.raise".to_i_with_method }.to raise_error(NoMethodError, /private method [`']raise' called/)
   end
 end