Increase socket_timeout for memcached inside tests

It sounds like a default timeout of 1 second can sometimes not be enough.
In normal operations, this should be fine (will result in a cache miss),
but in these tests, we always expect the cache to return the value, hence doing this change for these tests only.

Co-authored-by: Matthew Draper <[email protected]>

Author: codeminator

activesupport/test/cache/stores/mem_cache_store_test.rb

@@ -45,7 +45,7 @@ def ensure_connected! # after https://github.com/petergoldstein/dalli/pull/863
   end
 
   def lookup_store(*addresses, **options)
-    cache = ActiveSupport::Cache.lookup_store(:mem_cache_store, *addresses, { namespace: @namespace, pool: false }.merge(options))
+    cache = ActiveSupport::Cache.lookup_store(:mem_cache_store, *addresses, { namespace: @namespace, pool: false, socket_timeout: 60 }.merge(options))
     (@_stores ||= []) << cache
     cache
   end