Notify slack on scheduled test failure #707

Job	Run time
Check Manifest	23s
Check Linting	19s
Run brainmapper tests to check for breakages	13m 29s
Run tests with numba disabled	11m 30s
Run package tests (ubuntu-latest, 3.10)	11m 57s
Run package tests (ubuntu-latest, 3.11)	12m 45s
Run package tests (ubuntu-latest, 3.12)	15m 6s
Run package tests (macos-latest, 3.12)	8m 53s
Run package tests (windows-latest, 3.12)	15m 49s
Build source distribution	0s
Publish build distributions	0s
	1h 30m 11s

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