[rubygems/rubygems] Replace StandardError with Exception

We think it's unlikely that `rubygems/defaults/operating_system` could be shipped with a SyntaxError so StandardError could be better choice to prevent "false positives" errors.

https://github.com/rubygems/rubygems/commit/1f73e784dd

lib/rubygems.rb

@@ -1332,7 +1332,7 @@ begin
   require 'rubygems/defaults/operating_system'
 rescue LoadError
   # Ignored
-rescue Exception => e
+rescue StandardError => e
   msg = "#{e.message}\n" \
     "Loading the rubygems/defaults/operating_system.rb file caused an error. " \
     "This file is owned by your OS, not by rubygems upstream. " \

test/rubygems/test_rubygems.rb

@@ -10,12 +10,12 @@ class GemTest < Gem::TestCase
     pend "does not apply to truffleruby" if RUBY_ENGINE == 'truffleruby'
 
     path = util_install_operating_system_rb <<-RUBY
-      intentional synt'ax error
+      intentionally_not_implemented_method
     RUBY
 
     output = Gem::Util.popen(*ruby_with_rubygems_and_fake_operating_system_in_load_path(path), '-e', "'require \"rubygems\"'", {:err => [:child, :out]}).strip
     assert !$?.success?
-    assert_includes output, "unterminated string meets end of file (SyntaxError)"
+    assert_includes output, "undefined local variable or method `intentionally_not_implemented_method'"
     assert_includes output, "Loading the rubygems/defaults/operating_system.rb file caused an error. " \
     "This file is owned by your OS, not by rubygems upstream. " \
     "Please find out which OS package this file belongs to and follow the guidelines from your OS to report " \