PYTHON-4779 Use slots for Selection and TopologyDescription #7713

Job	Run time
static	4m 21s
Make an sdist	12s
CPython pypy-3.10-ubuntu-latest	10m 13s
CPython 3.9-ubuntu-latest	9m 6s
CPython 3.13-ubuntu-latest	8m 50s
CPython 3.13t-ubuntu-latest	9m 4s
Docs Checks	46s
Test async's minimum dependencies and Python	44s
Link Check	1m 47s
DocTest	56s
Test using minimum dependencies and supported Python	30s
Typing Tests (3.11)	1m 4s
Typing Tests (3.9)	1m 5s
Install from SDist and Test	43s
	49m 21s

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