`test_uniq::gnu_tests` often fails with `failed to write to stdin of child: Broken pipe`

[sylvestre]

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I stopped counting the number of time I saw this issue in the CI:

run: /Users/runner/work/coreutils/coreutils/target/debug/coreutils uniq -D
Test 111
current_directory_resolved: 
run: /Users/runner/work/coreutils/coreutils/target/debug/coreutils uniq -D -w1
Test 112
current_directory_resolved: 
run: /Users/runner/work/coreutils/coreutils/target/debug/coreutils uniq -D -c
thread 'test_uniq::gnu_tests' panicked at 'failed to write to stdin of child: Broken pipe (os error 32)', tests/common/util.rs:1091:21