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gh-133454: Reduce the number of threads in test_racing_getbuf_and_releasebuf (GH-133458)

The original reproducer only used 10 threads.

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+11

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Lines changed: 11 additions & 9 deletions

Original file line number	Diff line number	Diff line change
`@@ -743,19 +743,21 @@ def test_racing_getbuf_and_releasebuf(self):`
`743`	`743`	`frommultiprocessing.managersimportSharedMemoryManager`
`744`	`744`	`exceptImportError:`
`745`	`745`	`self.skipTest("Test requires multiprocessing")`
`746`		`-fromthreadingimportThread`
	`746`	`+fromthreadingimportThread,Event`
`747`	`747`
`748`		`-n=100`
	`748`	`+start=Event()`
`749`	`749`	`withSharedMemoryManager()assmm:`
`750`	`750`	`obj=smm.ShareableList(range(100))`
`751`		`-threads= []`
`752`		`-for_inrange(n):`
`753`		-# Issue gh-127085, the `ShareableList.count` is just a convenient way to mess the `exports`
`754`		-# counter of `memoryview`, this issue has no direct relation with `ShareableList`.
`755`		`-threads.append(Thread(target=obj.count,args=(1,)))`
`756`		`-`
	`751`	`+deftest():`
	`752`	+# Issue gh-127085, the `ShareableList.count` is just a
	`753`	+# convenient way to mess the `exports` counter of `memoryview`,
	`754`	+# this issue has no direct relation with `ShareableList`.
	`755`	`+start.wait(support.SHORT_TIMEOUT)`
	`756`	`+foriinrange(10):`
	`757`	`+obj.count(1)`
	`758`	`+threads= [Thread(target=test)for_inrange(10)]`
`757`	`759`	`withthreading_helper.start_threads(threads):`
`758`		`-pass`
	`760`	`+start.set()`
`759`	`761`
`760`	`762`	`delobj`
`761`	`763`

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