gh-122191: Fix test_warnings failure if run with -Werror #120760

Job	Run time
Check for source changes	10s
Check if generated files are up to date	5m 3s
Docs	0s
Windows MSI${{ '' }}	0s
Address sanitizer	11m 7s
Ubuntu SSL tests with OpenSSL (1.1.1w)	2m 2s
Ubuntu SSL tests with OpenSSL (3.0.13)	2m 7s
Hypothesis tests on Ubuntu	5m 31s
Ubuntu SSL tests with OpenSSL (3.1.5)	1m 59s
Ubuntu SSL tests with OpenSSL (3.2.1)	2m 1s
CIFuzz	0s
macOS / build and test (ghcr.io/cirruslabs/macos-runner:sonoma)	4m 44s
macOS / build and test (macos-13)	11m 2s
macOS (free-threading) / build and test (ghcr.io/cirruslabs/macos-runner:sonoma)	5m 24s
Thread sanitizer / Thread sanitizer	4m 26s
Thread sanitizer (free-threading) / Thread sanitizer	6m 0s
WASI / build and test	6m 49s
Windows / build (arm64)	3m 37s
Windows (free-threading) / build (arm64)	2m 24s
Windows (free-threading) / build and test (Win32)	23m 14s
Windows / build and test (Win32)	16m 42s
Windows / build and test (x64)	17m 0s
Windows (free-threading) / build and test (x64)	21m 15s
Ubuntu / build and test	8m 47s
Ubuntu (free-threading) / build and test	9m 41s
All required checks pass	2s
	2h 51m 7s

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