fix: add thread safety to TryLookup by locking _storeLock #130
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This commit addresses an intermittent error that occurs in the
FixedCache.TryLookupmethod when multiple threads access it simultaneously. The error was caused bywrappedEntrybeing null due to race conditions. To fix this, alock (_storeLock)was added around theTryLookupmethod to ensure thread-safe access, similar to other parts of the code that already use this locking mechanism.Closes #129.