gh-123228: don't leak file descriptors in pyrepl test #123402

Job	Run time
Change detection / Compute changed files	13s
Check if generated files are up to date	4m 56s
Docs	0s
Windows MSI${{ '' }}	0s
Address sanitizer	7m 29s
Ubuntu SSL tests with OpenSSL (1.1.1w)	2m 4s
Ubuntu SSL tests with OpenSSL (3.0.13)	1m 59s
Ubuntu SSL tests with OpenSSL (3.1.5)	2m 1s
Ubuntu SSL tests with OpenSSL (3.2.1)	2m 15s
CIFuzz	0s
Hypothesis tests on Ubuntu	5m 17s
Thread sanitizer / Thread sanitizer	3m 59s
Thread sanitizer (free-threading) / Thread sanitizer	7m 14s
WASI / build and test	5m 53s
macOS (free-threading) / build and test (ghcr.io/cirruslabs/macos-runner:sonoma)	5m 35s
macOS / build and test (ghcr.io/cirruslabs/macos-runner:sonoma)	4m 44s
macOS / build and test (macos-13)	11m 27s
Ubuntu / build and test	6m 48s
Ubuntu (free-threading) / build and test	9m 12s
Windows / build (arm64)	2m 35s
Windows (free-threading) / build (arm64)	2m 42s
Windows / build and test (Win32)	15m 59s
Windows (free-threading) / build and test (Win32)	23m 11s
Windows / build and test (x64)	15m 10s
Windows (free-threading) / build and test (x64)	21m 56s
All required checks pass	4s
	2h 42m 43s

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