gh-127691: add type checks when using `PyUnicodeError` objects #135005

Job	Run time
Change detection / Compute changed files	9s
Check if Autoconf files are up to date	23s
Ubuntu SSL tests with OpenSSL (ubuntu-24.04, 3.0.15)	2m 37s
Ubuntu SSL tests with OpenSSL (ubuntu-24.04, 3.1.7)	4m 18s
Ubuntu SSL tests with OpenSSL (ubuntu-24.04, 3.2.3)	3m 36s
Check if generated files are up to date	7m 1s
Ubuntu SSL tests with OpenSSL (ubuntu-24.04, 3.3.2)	2m 44s
Address sanitizer (ubuntu-24.04)	8m 55s
Ubuntu SSL tests with OpenSSL (ubuntu-24.04, 3.4.0)	2m 31s
CIFuzz (address)	20m 26s
CIFuzz (undefined)	21m 3s
Hypothesis tests on Ubuntu	6m 26s
Windows MSI${{ '' }}	0s
CIFuzz (memory)	20m 58s
Thread sanitizer / Thread sanitizer	4m 0s
Thread sanitizer (free-threading) / Thread sanitizer	7m 44s
WASI / build and test	5m 4s
macOS (free-threading) / build and test (ghcr.io/cirruslabs/macos-runner:sonoma)	5m 31s
macOS / build and test (macos-13)	8m 12s
macOS / build and test (ghcr.io/cirruslabs/macos-runner:sonoma)	4m 32s
Ubuntu / build and test (ubuntu-24.04)	8m 30s
Ubuntu / build and test (ubuntu-24.04-aarch64)	9m 13s
Ubuntu (free-threading) / build and test (ubuntu-24.04)	11m 25s
Ubuntu (free-threading) / build and test (ubuntu-24.04-aarch64)	12m 3s
Windows / build and test (arm64)	2m 46s
Windows (free-threading) / build and test (arm64)	2m 49s
Windows / build and test (Win32)	15m 34s
Windows / build and test (x64)	15m 6s
Windows (free-threading) / build and test (x64)	22m 16s
Docs / Docs	2m 3s
Docs / Docs (Oldest Sphinx)	2m 12s
Docs / Doctest	4m 25s
All required checks pass	2s
	4h 4m 34s

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