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ci: Avoid deadlock while reading uncrustify output

Robert Mader requested to merge rmader/mutter:ci-deadlock into main

The docu for Popen.wait() says:

This will deadlock when using stdout=PIPE and/or stderr=PIPE and the child process generates enough output to a pipe such that it blocks waiting for the OS pipe buffer to accept more data.

Fixes 3caa5fea

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