refactor: Fix phpstan return.type #12815

Job	Run time
Setup PHP Version for Code Coverage	1s
Others (8.2) / Sanity Tests	3m 46s
Others (8.3) / Sanity Tests	2m 41s
Others (8.1) / Sanity Tests	2m 32s
CacheLive (8.1) / Cache Live Tests	2m 13s
CacheLive (8.2) / Cache Live Tests	2m 28s
CacheLive (8.3) / Cache Live Tests	2m 5s
SeparateProcess (8.1) / tests	3m 35s
DatabaseLive (8.1, MySQLi, 5.7) / tests	3m 24s
DatabaseLive (8.1, MySQLi, 8.0) / tests	4m 20s
DatabaseLive (8.1, OCI8, 8.0) / tests	6m 24s
DatabaseLive (8.1, Postgre, 8.0) / tests	2m 36s
DatabaseLive (8.1, SQLite3, 8.0) / tests	2m 40s
DatabaseLive (8.1, SQLSRV, 8.0) / tests	4m 41s
DatabaseLive (8.2, MySQLi, 8.0) / tests	5m 44s
DatabaseLive (8.2, OCI8, 8.0) / tests	6m 46s
SeparateProcess (8.2) / tests	3m 12s
SeparateProcess (8.3) / tests	3m 36s
DatabaseLive (8.2, Postgre, 8.0) / tests	3m 9s
DatabaseLive (8.2, SQLite3, 8.0) / tests	3m 23s
DatabaseLive (8.2, SQLSRV, 8.0) / tests	4m 47s
DatabaseLive (8.3, OCI8, 8.0) / tests	6m 5s
DatabaseLive (8.3, Postgre, 8.0) / tests	2m 47s
DatabaseLive (8.3, MySQLi, 8.0) / tests	4m 11s
DatabaseLive (8.3, SQLite3, 8.0) / tests	2m 26s
DatabaseLive (8.3, SQLSRV, 8.0) / tests	4m 15s
Upload coverage results to Coveralls / coveralls	36s
	1h 34m 23s

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