gh-123619: Add an unstable C API function for enabling deferred reference counting #132527

Job	Run time
Change detection / Compute changed files	24s
Check if Autoconf files are up to date	20s
Ubuntu SSL tests with OpenSSL (ubuntu-24.04, 3.0.15)	2m 49s
Check if generated files are up to date	3m 47s
Ubuntu SSL tests with OpenSSL (ubuntu-24.04, 3.1.7)	2m 52s
Address sanitizer (ubuntu-24.04)	10m 23s
Ubuntu SSL tests with OpenSSL (ubuntu-24.04, 3.2.3)	2m 32s
Ubuntu SSL tests with OpenSSL (ubuntu-24.04, 3.3.2)	2m 44s
CIFuzz (address)	19m 25s
Windows MSI${{ '' }}	0s
CIFuzz (undefined)	21m 7s
Hypothesis tests on Ubuntu	6m 50s
CIFuzz (memory)	21m 3s
Thread sanitizer / Thread sanitizer	5m 27s
Thread sanitizer (free-threading) / Thread sanitizer	7m 56s
WASI / build and test	6m 21s
Windows / build (arm64)	3m 23s
Windows (free-threading) / build (arm64)	3m 23s
Windows / build and test (Win32)	16m 41s
Windows (free-threading) / build and test (Win32)	24m 50s
Windows / build and test (x64)	15m 57s
Windows (free-threading) / build and test (x64)	22m 43s
macOS (free-threading) / build and test (ghcr.io/cirruslabs/macos-runner:sonoma)	5m 9s
macOS / build and test (ghcr.io/cirruslabs/macos-runner:sonoma)	4m 46s
macOS / build and test (macos-13)	13m 55s
Ubuntu / build and test (ubuntu-24.04)	9m 12s
Ubuntu (free-threading) / build and test (ubuntu-24.04)	13m 4s
Docs / Docs	2m 9s
Docs / Docs (Oldest Sphinx)	2m 14s
Docs / Doctest	29m 35s
All required checks pass	4s
	4h 41m 5s

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