refactor: upgrade to PHP 8.1 with rector #11109

Job	Run time
Setup PHP Version for Code Coverage	1s
Others (8.1) / Sanity Tests	2m 42s
Others (8.3) / Sanity Tests	2m 27s
Others (8.2) / Sanity Tests	3m 57s
SeparateProcess (8.1) / tests	3m 51s
SeparateProcess (8.2) / tests	3m 25s
CacheLive (8.3) / Cache Live Tests	2m 6s
CacheLive (8.1) / Cache Live Tests	2m 8s
SeparateProcess (8.3) / tests	3m 33s
DatabaseLive (8.1, MySQLi, 8.0) / tests	4m 25s
DatabaseLive (8.1, OCI8, 8.0) / tests	5m 57s
DatabaseLive (8.1, MySQLi, 5.7) / tests	3m 19s
CacheLive (8.2) / Cache Live Tests	2m 30s
DatabaseLive (8.1, Postgre, 8.0) / tests	2m 52s
DatabaseLive (8.1, SQLSRV, 8.0) / tests	4m 39s
DatabaseLive (8.1, SQLite3, 8.0) / tests	3m 4s
DatabaseLive (8.2, MySQLi, 8.0) / tests	4m 39s
DatabaseLive (8.2, OCI8, 8.0) / tests	6m 38s
DatabaseLive (8.2, Postgre, 8.0) / tests	3m 30s
DatabaseLive (8.2, SQLite3, 8.0) / tests	3m 53s
DatabaseLive (8.2, SQLSRV, 8.0) / tests	4m 56s
DatabaseLive (8.3, MySQLi, 8.0) / tests	3m 51s
DatabaseLive (8.3, OCI8, 8.0) / tests	6m 5s
DatabaseLive (8.3, Postgre, 8.0) / tests	2m 57s
DatabaseLive (8.3, SQLite3, 8.0) / tests	2m 45s
DatabaseLive (8.3, SQLSRV, 8.0) / tests	4m 37s
Upload coverage results to Coveralls / coveralls	46s
	1h 35m 33s

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