gh-117657: Fix TSan race in _PyDict_CheckConsistency #119055

Job	Run time
Check for source changes	9s
Check if generated files are up to date	4m 49s
Docs	0s
Address sanitizer	7m 42s
Ubuntu SSL tests with OpenSSL (1.1.1w)	1m 59s
CIFuzz (address)	19m 53s
Ubuntu SSL tests with OpenSSL (3.0.13)	2m 4s
Hypothesis tests on Ubuntu	5m 21s
CIFuzz (undefined)	20m 32s
Ubuntu SSL tests with OpenSSL (3.1.5)	2m 0s
CIFuzz (memory)	20m 24s
Ubuntu SSL tests with OpenSSL (3.2.1)	1m 53s
Windows / build and test (x64)	16m 29s
Windows / build (arm64)	3m 28s
Windows / build and test (x86)	15m 23s
macOS / build and test (ghcr.io/cirruslabs/macos-runner:sonoma)	5m 3s
macOS (free-threading) / build and test (ghcr.io/cirruslabs/macos-runner:sonoma)	6m 28s
macOS / build and test (macos-13)	11m 27s
Windows (free-threading) / build and test (x64)	22m 38s
Windows (free-threading) / build (arm64)	2m 27s
Windows (free-threading) / build and test (x86)	23m 29s
Thread sanitizer / Thread sanitizer	4m 25s
Ubuntu / build and test	6m 57s
Ubuntu (free-threading) / build and test	8m 35s
WASI / build and test	6m 33s
Thread sanitizer (free-threading) / Thread sanitizer	7m 29s
All required checks pass	2s
	3h 47m 39s

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