Merge pull request #6194 from cylc/8.3.x-sync #130

Job	Run time
1/4	13m 2s
2/4	13m 33s
3/4	13m 28s
4/4	13m 56s
py-3-latest	20m 9s
flaky	6m 53s
_remote_background_indep_poll	5m 3s
_remote_background_indep_tcp	6m 56s
macos 1/5	1s
macos 2/5	1s
codecov	0s
	1h 33m 2s

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