'Synchronized' in PhCached.java Risks Thread-Safety, Requires Replacement

[0pdd]

The puzzle 4884-73fc2856 from #4884 has to be resolved:

eo/eo-runtime/src/main/java/org/eolang/PhCached.java

Lines 16 to 19 in d7c6aea

	* @todo #4884:30min Replace 'synchronized' with ReentrantLock.
	* We need to replace 'synchronized' with ReentrantLock to avoid potential
	* deadlocks when multiple threads are trying to access the cache simultaneously.
	* Moreover, 'synchronized' keyword is forbidden by qulice.

The puzzle was created by Yegor Bugayenko on 01-Mar-26.

Estimate: 30 minutes, role: DEV.

If you have any technical questions, don't ask me, submit new tickets instead. The task will be "done" when the problem is fixed and the text of the puzzle is removed from the source code. Here is more about PDD and about me.

[AlexNetTie]

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