Deprecate `squeeze` in GroupBy. #10911

Job	Run time
detect ci trigger	5s
Mypy	1m 10s
Mypy 3.9	1m 9s
Doctests	1m 11s
Minimum Version Policy (bare-minimum)	41s
Minimum Version Policy (min-all-deps)	37s
Pyright	0s
Pyright 3.9	0s
	4m 53s

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