Remove undefined method =~ from Pathname

Co-authored-by: Kevin Menard <kevin.menard@shopify.com>

Author: patricklinpl

CHANGELOG.md

@@ -44,7 +44,7 @@ Compatibility:
 * Do not autosplat a proc that accepts a single positional argument and keywords (#3039, @andrykonchin).
 * Support passing anonymous * and ** parameters as method call arguments (#3039, @andrykonchin).
 * Handle either positional or keywords arguments by default in `Struct.new` (#3039, @rwstauner).
-* Remove deprecated methods `Dir.exists?`, `File.exists?`, and `Kernel#=~` (#3039, @patricklinpl).
+* Remove deprecated methods `Dir.exists?`, `File.exists?`, and `Kernel#=~` (#3039, @patricklinpl, @nirvdrum).
 
 Performance:
 

lib/truffle/pathname.rb

@@ -1084,10 +1084,6 @@ def unlink()
   alias delete unlink
 end
 
-class Pathname
-  undef =~
-end
-
 module Kernel
   # create a pathname object.
   #