refactor: Fix `phpstan` errors related to `Autoloader` #12419

Job	Run time
Setup PHP Version for Code Coverage	1s
Others (8.1) / Sanity Tests	2m 36s
Others (8.3) / Sanity Tests	2m 38s
Others (8.2) / Sanity Tests	3m 39s
CacheLive (8.1) / Cache Live Tests	1m 58s
CacheLive (8.2) / Cache Live Tests	2m 31s
CacheLive (8.3) / Cache Live Tests	2m 5s
DatabaseLive (8.1, MySQLi, 8.0) / tests	4m 28s
DatabaseLive (8.1, OCI8, 8.0) / tests	6m 16s
DatabaseLive (8.1, Postgre, 8.0) / tests	2m 33s
DatabaseLive (8.1, MySQLi, 5.7) / tests	2m 46s
DatabaseLive (8.1, SQLite3, 8.0) / tests	2m 37s
DatabaseLive (8.1, SQLSRV, 8.0) / tests	7m 50s
DatabaseLive (8.2, MySQLi, 8.0) / tests	4m 53s
DatabaseLive (8.2, Postgre, 8.0) / tests	3m 12s
DatabaseLive (8.2, OCI8, 8.0) / tests	7m 2s
DatabaseLive (8.2, SQLSRV, 8.0) / tests	4m 56s
DatabaseLive (8.3, MySQLi, 8.0) / tests	4m 18s
DatabaseLive (8.2, SQLite3, 8.0) / tests	3m 29s
DatabaseLive (8.3, OCI8, 8.0) / tests	6m 9s
DatabaseLive (8.3, Postgre, 8.0) / tests	2m 29s
DatabaseLive (8.3, SQLite3, 8.0) / tests	2m 26s
DatabaseLive (8.3, SQLSRV, 8.0) / tests	4m 31s
SeparateProcess (8.1) / tests	4m 9s
SeparateProcess (8.2) / tests	3m 29s
SeparateProcess (8.3) / tests	3m 28s
Upload coverage results to Coveralls / coveralls	35s
	1h 37m 4s

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