tests: Reduce thread and iteration count on CI for /thread/rec-mutex3

Merged Philip Withnall requested to merge wip/pwithnall/macos-testing into main

It’s fairly consistently timing out on macOS. Looking at the verbose test output, it’s still making progress right up until when it times out (i.e. it hasn’t hit a GRecMutex bug and hasn’t deadlocked), so it seems that the test runner is just hopelessly overloaded/underpowered for the number of threads and iterations we’re asking it to test.

Tone those numbers down for CI test runs then.

Signed-off-by: Philip Withnall pwithnall@endlessos.org

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