PYTHON-5491 Update test for dropIndex behavior change (#2546) #8221

Job	Run time
static	4m 16s
Make an sdist	19s
Docs Checks	42s
DocTest	1m 10s
CPython pypy-3.10-ubuntu-latest	12m 30s
Link Check	2m 39s
CPython 3.9-ubuntu-latest	11m 21s
CPython 3.13t-ubuntu-latest	11m 25s
Typing Tests (3.9)	54s
Typing Tests (3.11)	52s
Test async's minimum dependencies and Python	47s
Test using minimum dependencies and supported Python	41s
Install from SDist and Test	1m 6s
	48m 42s

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