libuv: Persistent fs_event_error_reporting CI failures on macOS 10.15

To support https://github.com/libuv/libuv/pull/2682 a cmake based job was added for macOS. The first CI macOS hosts to have cmake added to them were 10.15 (as we were setting those up from scratch). There’s a persistent failure in the CI with v1.x on the 10.15 hosts that we’re not seeing on 10.11:

e.g. https://ci.nodejs.org/view/libuv/job/libuv-test-commit-osx-cmake/26/nodes=osx1015/console

not ok 48 - fs_event_error_reporting
# timeout
# Output from process `fs_event_error_reporting`: (no output)

FWIW @bnoordhuis wasn’t able to reproduce on macOS 10.14.