Horton

ci: macos: Reduce test concurrency

Andres Freund <andres@anarazel.de>

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Commit: b507a7a19b5d9a8ed2500c5a7159353e02846901
Author: Andres Freund <andres@anarazel.de>
Date: 2022-10-01T23:56:15Z
Releases: 15.0 
ci: macos: Reduce test concurrency

Test performance regresses noticably when using all cores. This is more
pronounced with meson than with autoconf, presumably because meson will
schedule the "full number" of tests more consistently.  8 seems to work
OK.

Discussion: https://postgr.es/m/20220927040208.l3shfcidovpzqxfh@awork3.anarazel.de
Backpatch: 15-, where CI was introduced

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