gh-126012: Add `__class_getitem__` to `memoryview` #130502

Job	Run time
Change detection / Compute changed files	11s
Check if Autoconf files are up to date	20s
Check if generated files are up to date	3m 23s
Address sanitizer	7m 41s
Ubuntu SSL tests with OpenSSL (ubuntu-22.04, 3.0.15)	2m 7s
Windows MSI${{ '' }}	0s
CIFuzz (address)	20m 29s
Ubuntu SSL tests with OpenSSL (ubuntu-22.04, 3.1.7)	2m 13s
Hypothesis tests on Ubuntu	5m 27s
Ubuntu SSL tests with OpenSSL (ubuntu-22.04, 3.2.3)	2m 8s
CIFuzz (undefined)	21m 37s
Ubuntu SSL tests with OpenSSL (ubuntu-22.04, 3.3.2)	2m 2s
CIFuzz (memory)	20m 38s
Thread sanitizer / Thread sanitizer	3m 0s
Thread sanitizer (free-threading) / Thread sanitizer	7m 19s
WASI / build and test	6m 6s
macOS (free-threading) / build and test (ghcr.io/cirruslabs/macos-runner:sonoma)	5m 21s
macOS / build and test (ghcr.io/cirruslabs/macos-runner:sonoma)	5m 39s
macOS / build and test (macos-13)	9m 23s
Windows / build (arm64)	2m 8s
Windows (free-threading) / build (arm64)	3m 13s
Windows / build and test (Win32)	16m 41s
Windows (free-threading) / build and test (x64)	22m 33s
Windows (free-threading) / build and test (Win32)	24m 2s
Windows / build and test (x64)	16m 28s
Ubuntu / build and test (ubuntu-22.04)	7m 35s
Ubuntu (free-threading) / build and test (ubuntu-22.04)	9m 17s
Docs / Docs	2m 13s
Docs / Docs (Oldest Sphinx)	2m 4s
Docs / Doctest	29m 7s
All required checks pass	2s
	4h 20m 27s

Provide feedback