Update scalameta to 4.8.7 (#1232) #1147

Job	Run time
examples (ubuntu-latest)	5m 58s
examples (windows-latest)	11m 7s
format	24s
bincompat	9m 34s
integration-tests (ubuntu-20.04)	41m 23s
integration-tests (macos-latest)	47m 41s
integration-tests (windows-latest)	33m 0s
publishLocal	31m 24s
website	2m 1s
test (ubuntu-latest, 8, 2.12.17)	4m 19s
test (ubuntu-latest, 8, 2.12.18)	4m 3s
test (ubuntu-latest, 8, 2.13.10)	3m 32s
test (ubuntu-latest, 8, 2.13.11)	3m 33s
test (ubuntu-latest, 8, 3.3.0)	4m 41s
test (windows-latest, 8, 2.13.11)	6m 29s
test (macos-latest, 8, 2.13.11)	5m 12s
test (ubuntu-latest, 17, 2.12.18)	19m 34s
all-tests	1s
	3h 53m 56s

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