Bump actions/stale from 8.0.0 to 9.0.0 #251

Job	Run time
analyze (dev)	23s
test_flutter (ubuntu-latest, beta)	1m 41s
test_dart (ubuntu-latest, 3.0.0)	1m 54s
test_flutter (ubuntu-latest, stable)	2m 0s
test_dart (ubuntu-latest, dev)	1m 13s
test_flutter (macos-latest, beta)	3m 33s
test_dart (macos-latest, 3.0.0)	4m 34s
test_flutter (macos-latest, stable)	2m 55s
test_dart (macos-latest, dev)	1m 57s
test_flutter (windows-latest, beta)	3m 19s
test_dart (windows-latest, 3.0.0)	2m 8s
test_flutter (windows-latest, stable)	3m 19s
test_dart (windows-latest, dev)	1m 38s
	30m 34s

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