[Fix #11800] Mark Style/InvertibleUnlessCondition as unsafe

Fixes #11800.

This PR marks `Style/InvertibleUnlessCondition` as unsafe.
`@safety` is already documented:
https://github.com/rubocop/rubocop/blob/v1.50.1/lib/rubocop/cop/style/invertible_unless_condition.rb#L20-L23

Author: koic

changelog/fix_mark_style_invertible_unless_condition_as_unsafe.md

@@ -0,0 +1 @@
+* [#11800](https://github.com/rubocop/rubocop/issues/11800): Mark `Style/InvertibleUnlessCondition` as unsafe. ([@koic][])

config/default.yml

@@ -4067,7 +4067,9 @@ Style/InverseMethods:
 Style/InvertibleUnlessCondition:
   Description: 'Favor `if` with inverted condition over `unless`.'
   Enabled: false
+  Safe: false
   VersionAdded: '1.44'
+  VersionChanged: '<<next>>'
   # `InverseMethods` are methods that can be inverted in a `unless` condition.
   # The relationship of inverse methods needs to be defined in both directions.
   # Keys and values both need to be defined as symbols.