Bump cli, core, schema 15.18.0 -> 15.18.1 #1538

Job	Run time
Lint	42s
Smoke test - cli (macos-latest, 18.x)	2m 6s
Smoke test - cli (macos-latest, 20.x)	1m 55s
Smoke test - cli (ubuntu-latest, 18.x)	2m 21s
Smoke test - core, schema (18.x)	1m 53s
Smoke test - cli (ubuntu-latest, 20.x)	2m 4s
Smoke test - core, schema (20.x)	1m 42s
Test - cli (macos-latest, 18.x)	52s
Test - core, schema, legacy-scripting-runner (18.x)	1m 16s
Test - cli (macos-latest, 20.x)	50s
Test - core, schema, legacy-scripting-runner (20.x)	1m 59s
Test - cli (ubuntu-latest, 18.x)	1m 6s
Test - cli (ubuntu-latest, 20.x)	52s
Test - schema-to-ts	14s
	19m 52s

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