runtime(ruby): Update ftplugin and omni-complete (#13805)

Signed-off-by: Doug Kearns <dougkearns@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/autoload/rubycomplete.vim b/runtime/autoload/rubycomplete.vim
index 3677b25..6ead0fd 100644
--- a/runtime/autoload/rubycomplete.vim
+++ b/runtime/autoload/rubycomplete.vim
@@ -2,8 +2,7 @@
 " Language:		Ruby
 " Maintainer:		Mark Guzman <segfault@hasno.info>
 " URL:			https://github.com/vim-ruby/vim-ruby
-" Release Coordinator:	Doug Kearns <dougkearns@gmail.com>
-" Last Change:		2020 Apr 12
+" Last Change:		2023 Dec 31
 " ----------------------------------------------------------------------------
 "
 " Ruby IRB/Complete author: Keiju ISHITSUKA(keiju@ishitsuka.com)
@@ -490,7 +489,7 @@
         trail = "%s%s" % [ dir, sub ]
         tcfg = "%sconfig" % trail
 
-        if File.exists?( tcfg )
+        if File.exist?( tcfg )
           rails_base = trail
           break
         end
@@ -503,7 +502,7 @@
 
     bootfile = rails_base + "config/boot.rb"
     envfile = rails_base + "config/environment.rb"
-    if File.exists?( bootfile ) && File.exists?( envfile )
+    if File.exist?( bootfile ) && File.exist?( envfile )
       begin
         require bootfile
         require envfile