tests/thread: Make stack-size test run correctly and reliable on uPy.
tests/thread: Make stack-size test run correctly and reliable on uPy.

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em/micropython,puuu/micropython,pozetroninc/micropython,dxxb/micropython,tuc-osg/micropython,cwyark/micropython,selste/micropython,tuc-osg/micropython,pramasoul/micropython,adafruit/micropython,tralamazza/micropython,micropython/micropython-esp32,pramasoul/micropython,turbinenreiter/micropython,bvernoux/micropython