refactor: fix phpstan errors in `Connection` #16159

Job	Run time
Setup PHP Version for Code Coverage	2s
Others (8.2) / Sanity Tests	2m 43s
Others (8.5) / Sanity Tests	1m 23s
Others (8.3) / Sanity Tests	1m 22s
Others (8.4) / Sanity Tests	1m 17s
CacheLive (8.4) / Cache Live Tests	1m 8s
SeparateProcess (8.4) / tests	1m 40s
CacheLive (8.5) / Cache Live Tests	1m 9s
SeparateProcess (8.2) / tests	2m 13s
SeparateProcess (8.3) / tests	2m 10s
CacheLive (8.2) / Cache Live Tests	1m 17s
SeparateProcess (8.5) / tests	2m 16s
CacheLive (8.3) / Cache Live Tests	1m 16s
DatabaseLive (8.3, SQLite3, 8.0) / tests	1m 22s
DatabaseLive (8.4, OCI8, 8.0) / tests	7m 11s
DatabaseLive (8.2, SQLSRV, 8.0) / tests	5m 45s
DatabaseLive (8.4, SQLite3, 8.0) / tests	1m 16s
DatabaseLive (8.2, OCI8, 8.0) / tests	7m 56s
DatabaseLive (8.3, OCI8, 8.0) / tests	7m 21s
DatabaseLive (8.4, SQLSRV, 8.0) / tests	6m 34s
DatabaseLive (8.4, MySQLi, 8.0) / tests	3m 6s
DatabaseLive (8.3, MySQLi, 8.0) / tests	4m 41s
DatabaseLive (8.3, SQLSRV, 8.0) / tests	7m 1s
DatabaseLive (8.2, SQLite3, 8.0) / tests	2m 12s
DatabaseLive (8.2, MySQLi, 5.7) / tests	2m 57s
DatabaseLive (8.2, Postgre, 8.0) / tests	5m 18s
DatabaseLive (8.5, MySQLi, 8.0) / tests	3m 57s
DatabaseLive (8.5, SQLSRV, 8.0) / tests	4m 48s
DatabaseLive (8.5, OCI8, 8.0) / tests	7m 45s
DatabaseLive (8.5, Postgre, 8.0) / tests	1m 47s
DatabaseLive (8.4, Postgre, 8.0) / tests	1m 46s
DatabaseLive (8.2, MySQLi, 8.0) / tests	4m 9s
DatabaseLive (8.3, Postgre, 8.0) / tests	1m 49s
DatabaseLive (8.5, SQLite3, 8.0) / tests	1m 53s
Upload coverage results to Coveralls / coveralls	36s
	1h 51m 6s

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