Simplify mkCacheInt32/mkCacheGeneric to use ConcurrentDictionary#486

sergey-tihon merged 2 commits intorepo-assist/fix-thread-safety-lazy-caches-481-a00dbff9b73cb3e8fsprojects/FSharp.TypeProviders.SDK:repo-assist/fix-thread-safety-lazy-caches-481-a00dbff9b73cb3e8from

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