refactor: Fix phpstan errors `offsetAccess.notFound` (#9486) #13034

Job	Run time
Setup PHP Version for Code Coverage	1s
Others (8.1) / Sanity Tests	2m 25s
Others (8.4) / Sanity Tests	2m 38s
Others (8.2) / Sanity Tests	3m 44s
Others (8.3) / Sanity Tests	2m 20s
CacheLive (8.3) / Cache Live Tests	1m 57s
CacheLive (8.2) / Cache Live Tests	2m 15s
CacheLive (8.4) / Cache Live Tests	2m 10s
CacheLive (8.1) / Cache Live Tests	1m 58s
DatabaseLive (8.1, MySQLi, 5.7) / tests	3m 46s
DatabaseLive (8.1, MySQLi, 8.0) / tests	5m 14s
DatabaseLive (8.1, OCI8, 8.0) / tests	6m 20s
DatabaseLive (8.1, Postgre, 8.0) / tests	3m 27s
DatabaseLive (8.1, SQLSRV, 8.0) / tests	5m 10s
DatabaseLive (8.1, SQLite3, 8.0) / tests	2m 22s
DatabaseLive (8.2, MySQLi, 8.0) / tests	6m 49s
SeparateProcess (8.1) / tests	3m 13s
SeparateProcess (8.2) / tests	4m 12s
SeparateProcess (8.3) / tests	3m 15s
SeparateProcess (8.4) / tests	3m 7s
DatabaseLive (8.2, OCI8, 8.0) / tests	7m 11s
DatabaseLive (8.2, Postgre, 8.0) / tests	3m 13s
DatabaseLive (8.2, SQLite3, 8.0) / tests	4m 17s
DatabaseLive (8.2, SQLSRV, 8.0) / tests	5m 28s
DatabaseLive (8.3, MySQLi, 8.0) / tests	5m 32s
DatabaseLive (8.3, OCI8, 8.0) / tests	6m 29s
DatabaseLive (8.3, Postgre, 8.0) / tests	2m 42s
DatabaseLive (8.3, SQLite3, 8.0) / tests	2m 35s
DatabaseLive (8.3, SQLSRV, 8.0) / tests	5m 50s
DatabaseLive (8.4, MySQLi, 8.0) / tests	5m 24s
DatabaseLive (8.4, OCI8, 8.0) / tests	7m 15s
DatabaseLive (8.4, Postgre, 8.0) / tests	3m 5s
DatabaseLive (8.4, SQLite3, 8.0) / tests	2m 45s
DatabaseLive (8.4, SQLSRV, 8.0) / tests	4m 56s
Upload coverage results to Coveralls / coveralls	43s
	2h 13m 48s

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