Remove .codeclimate.yml from gemspec s.files list

The file itself was removed in 18813c0 but was left in
the gemspec file list.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: yahonda

ruby-plsql.gemspec

@@ -19,7 +19,6 @@ Gem::Specification.new do |s|
     "README.md"
   ]
   s.files = [
-    ".codeclimate.yml",
     ".github/stale.yml",
     ".rubocop.yml",
     "Gemfile",