refactor: upgrade to PHP 8.1 with rector #11338

Job	Run time
Setup PHP Version for Code Coverage	1s
Others (8.3) / Sanity Tests	2m 52s
Others (8.2) / Sanity Tests	4m 13s
Others (8.1) / Sanity Tests	2m 44s
DatabaseLive (8.1, MySQLi, 5.7) / tests	3m 20s
DatabaseLive (8.1, MySQLi, 8.0) / tests	4m 45s
DatabaseLive (8.1, Postgre, 8.0) / tests	5m 5s
DatabaseLive (8.1, OCI8, 8.0) / tests	6m 15s
DatabaseLive (8.1, SQLite3, 8.0) / tests	3m 0s
DatabaseLive (8.1, SQLSRV, 8.0) / tests	5m 41s
DatabaseLive (8.2, MySQLi, 8.0) / tests	4m 40s
DatabaseLive (8.2, OCI8, 8.0) / tests	6m 44s
DatabaseLive (8.2, SQLite3, 8.0) / tests	3m 26s
DatabaseLive (8.2, SQLSRV, 8.0) / tests	6m 8s
DatabaseLive (8.3, MySQLi, 8.0) / tests	5m 29s
DatabaseLive (8.2, Postgre, 8.0) / tests	4m 5s
DatabaseLive (8.3, OCI8, 8.0) / tests	6m 33s
DatabaseLive (8.3, Postgre, 8.0) / tests	4m 3s
DatabaseLive (8.3, SQLite3, 8.0) / tests	3m 11s
DatabaseLive (8.3, SQLSRV, 8.0) / tests	5m 32s
CacheLive (8.1) / Cache Live Tests	2m 7s
CacheLive (8.2) / Cache Live Tests	3m 6s
CacheLive (8.3) / Cache Live Tests	2m 31s
SeparateProcess (8.1) / tests	3m 59s
SeparateProcess (8.2) / tests	3m 47s
SeparateProcess (8.3) / tests	3m 27s
Upload coverage results to Coveralls / coveralls	53s
	1h 47m 37s

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