gh-112075: Add a little specialization thread safety #100972

Job	Run time
Check for source changes	9s
Check if generated files are up to date	6m 33s
Address sanitizer	8m 43s
Ubuntu SSL tests with OpenSSL (1.1.1w)	2m 26s
Hypothesis tests on Ubuntu	4m 2s
Docs	0s
Ubuntu SSL tests with OpenSSL (3.0.11)	2m 5s
CIFuzz (address)	20m 39s
Ubuntu SSL tests with OpenSSL (3.1.3)	2m 36s
CIFuzz (undefined)	21m 1s
CIFuzz (memory)	22m 34s
Windows (free-threading) / build and test (x64)	20m 13s
Windows (free-threading) / build (arm64)	2m 49s
Windows (free-threading) / build and test (x86)	18m 33s
macOS / build and test	13m 49s
Windows / build and test (x86)	14m 5s
macOS (free-threading) / build and test	29m 3s
Ubuntu / build and test	5m 59s
Windows / build and test (x64)	14m 30s
Windows / build (arm64)	3m 52s
Ubuntu (free-threading) / build and test	9m 9s
All required checks pass	2s
	3h 42m 52s

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