Merge pull request rails#56687 from Saidbek/remove-unused-delegate-require-from-mem-cache-store

Remove unused delegate loading from MemCacheStore

Author: skipkayhil

activesupport/lib/active_support/cache/mem_cache_store.rb

@@ -8,7 +8,6 @@
 end
 
 require "connection_pool"
-require "delegate"
 require "active_support/core_ext/enumerable"
 require "active_support/core_ext/array/extract_options"
 require "active_support/core_ext/numeric/time"