ci(testrunner): rebuild 3.15-dev and pin Cython<3.3 on the 3.15 cache (PROF-14439) - #19907

ci(testrunner): rebuild 3.15-dev and pin Cython<3.3 on the 3.15 cache (PROF-14439)#19907

vlad-scherbich wants to merge 9 commits into

vlad/py315-pyo3-contextvarDataDog/dd-trace-py:vlad/py315-pyo3-contextvarfrom

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