Update `Coroutine.cr_frame` to return correct type (#11798) #865

Job	Run time
Run mypy against the stubs (linux, 3.8)	1m 36s
Run pytype against the stubs	1m 29s
Test typeshed with pyright (Linux, 3.8)	52s
Run mypy against the stubs (linux, 3.9)	1m 36s
Test typeshed with pyright (Linux, 3.9)	52s
Run mypy against the stubs (linux, 3.10)	1m 38s
Run mypy on the test cases	3m 10s
Test typeshed with pyright (Linux, 3.10)	1m 13s
Run mypy against the stubs (linux, 3.11)	1m 36s
Test typeshed with pyright (Linux, 3.11)	1m 12s
Run mypy against the stubs (linux, 3.12)	1m 45s
Test typeshed with pyright (Linux, 3.12)	53s
Run the stub_uploader tests	2m 54s
Run mypy against the stubs (win32, 3.8)	1m 34s
Test typeshed with pyright (Windows, 3.8)	54s
Run mypy against the stubs (win32, 3.9)	1m 40s
Test typeshed with pyright (Windows, 3.9)	52s
Run mypy against the stubs (win32, 3.10)	1m 37s
Check typeshed structure	7s
Test typeshed with pyright (Windows, 3.10)	1m 1s
Run mypy against the stubs (win32, 3.11)	1m 31s
Test typeshed with pyright (Windows, 3.11)	59s
Run mypy against the stubs (win32, 3.12)	1m 46s
Test typeshed with pyright (Windows, 3.12)	1m 6s
Run mypy against the stubs (darwin, 3.8)	1m 30s
Test typeshed with pyright (Darwin, 3.8)	57s
Run mypy against the stubs (darwin, 3.9)	1m 35s
Test typeshed with pyright (Darwin, 3.9)	56s
Run mypy against the stubs (darwin, 3.10)	1m 39s
Test typeshed with pyright (Darwin, 3.10)	57s
Run mypy against the stubs (darwin, 3.11)	1m 44s
Test typeshed with pyright (Darwin, 3.11)	55s
Run mypy against the stubs (darwin, 3.12)	1m 53s
Test typeshed with pyright (Darwin, 3.12)	57s
	46m 56s

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