gh-112075: Make PyDictKeysObject thread-safe #103566

Job	Run time
Check for source changes	7s
Address sanitizer	8m 32s
Ubuntu SSL tests with OpenSSL (1.1.1w)	2m 10s
Check if generated files are up to date	4m 43s
Ubuntu SSL tests with OpenSSL (3.0.13)	2m 13s
CIFuzz (address)	19m 40s
Docs	0s
Ubuntu SSL tests with OpenSSL (3.1.5)	2m 8s
CIFuzz (undefined)	21m 47s
Hypothesis tests on Ubuntu	5m 21s
Ubuntu SSL tests with OpenSSL (3.2.1)	1m 57s
CIFuzz (memory)	22m 27s
macOS / build and test (macos-14)	7m 40s
macOS (free-threading) / build and test (macos-14)	11m 55s
macOS / build and test (macos-13)	9m 52s
macOS (free-threading) / build and test (macos-13)	12m 59s
Ubuntu / build and test	6m 37s
Windows / build and test (x64)	13m 34s
Ubuntu (free-threading) / build and test	8m 21s
Windows / build (arm64)	3m 47s
Windows / build and test (x86)	15m 47s
Windows (free-threading) / build and test (x64)	15m 52s
Windows (free-threading) / build (arm64)	2m 22s
Windows (free-threading) / build and test (x86)	16m 44s
All required checks pass	4s
	3h 36m 39s

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