[12.x] Fix Cache spy not working with memoized cache #57996
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Fixes issue #57853 where using
Cache::spy()withCache::memo()->remember()would fail with "Call to a member function remember() on null".When you call
Cache::spy()and then try to useCache::memo()->remember(), the spy wasn't forwarding calls to the real CacheManager, somemo()was returning null. This meant you couldn't test code that uses memoized cache with spies.