refactor: enable ClosureReturnTypeRector #12280

Job	Run time
Setup PHP Version for Code Coverage	1s
Others (8.3) / Sanity Tests	2m 17s
Others (8.1) / Sanity Tests	2m 21s
Others (8.2) / Sanity Tests	3m 26s
CacheLive (8.3) / Cache Live Tests	1m 58s
CacheLive (8.1) / Cache Live Tests	2m 0s
SeparateProcess (8.1) / tests	3m 12s
CacheLive (8.2) / Cache Live Tests	2m 15s
DatabaseLive (8.1, MySQLi, 5.7) / tests	3m 0s
DatabaseLive (8.1, MySQLi, 8.0) / tests	4m 26s
DatabaseLive (8.1, OCI8, 8.0) / tests	5m 58s
DatabaseLive (8.1, Postgre, 8.0) / tests	2m 40s
DatabaseLive (8.1, SQLite3, 8.0) / tests	2m 31s
DatabaseLive (8.1, SQLSRV, 8.0) / tests	4m 2s
SeparateProcess (8.2) / tests	3m 14s
SeparateProcess (8.3) / tests	3m 6s
DatabaseLive (8.2, MySQLi, 8.0) / tests	4m 40s
DatabaseLive (8.2, OCI8, 8.0) / tests	6m 29s
DatabaseLive (8.2, Postgre, 8.0) / tests	3m 11s
DatabaseLive (8.2, SQLite3, 8.0) / tests	3m 10s
DatabaseLive (8.2, SQLSRV, 8.0) / tests	4m 42s
DatabaseLive (8.3, MySQLi, 8.0) / tests	3m 51s
DatabaseLive (8.3, OCI8, 8.0) / tests	5m 42s
DatabaseLive (8.3, Postgre, 8.0) / tests	2m 32s
DatabaseLive (8.3, SQLite3, 8.0) / tests	2m 26s
DatabaseLive (8.3, SQLSRV, 8.0) / tests	4m 34s
Upload coverage results to Coveralls / coveralls	33s
	1h 28m 17s

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