PYTHON-5593 Adds v4.15.2 notes to changelog #8324

Job	Run time
static	5m 13s
DocTest	1m 2s
Docs Checks	44s
CPython 3.10-ubuntu-latest	10m 58s
CPython 3.13t-ubuntu-latest	10m 58s
CPython pypy-3.10-ubuntu-latest	11m 0s
Typing Tests (3.10)	55s
Typing Tests (3.11)	54s
Link Check	1m 39s
Integration Tests	1m 7s
Make an sdist	15s
Test minimum dependencies and Python	45s
Install from SDist and Test	1m 2s
	46m 32s

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