Remove unused script conditional

Author: JonRowe

script/update_rubygems_and_install_bundler

@@ -11,22 +11,10 @@ function is_ruby_3_plus {
   fi
 }
 
-function is_ruby_26_plus {
-  if ruby -e "exit(RUBY_VERSION.to_f >= 2.6)"; then
-    return 0
-  else
-    return 1
-  fi
-}
-
 if is_ruby_3_plus; then
   gem update --no-document --system
   gem install --no-document bundler
-elif is_ruby_26_plus; then
+else
   gem update --no-document --system '3.4.22'
   gem install --no-document bundler
-else
-  echo "Warning installing older versions of Rubygems / Bundler"
-  gem update --system '3.3.26'
-  gem install bundler -v '2.3.26'
 fi