fix: correct `savePath` check in `MemcachedHandler` constructor #14205

Job	Run time
Setup PHP Version for Code Coverage	3s
Others (8.2) / Sanity Tests	3m 53s
Others (8.3) / Sanity Tests	2m 25s
Others (8.5) / Sanity Tests	2m 37s
Others (8.4) / Sanity Tests	2m 56s
CacheLive (8.4) / Cache Live Tests	2m 23s
SeparateProcess (8.3) / tests	3m 36s
DatabaseLive (8.2, MySQLi, 8.0) / tests	5m 8s
SeparateProcess (8.5) / tests	3m 44s
SeparateProcess (8.2) / tests	3m 44s
DatabaseLive (8.5, SQLSRV, 8.0) / tests	5m 31s
DatabaseLive (8.4, MySQLi, 8.0) / tests	4m 51s
DatabaseLive (8.2, SQLSRV, 8.0) / tests	6m 25s
CacheLive (8.3) / Cache Live Tests	2m 14s
DatabaseLive (8.2, OCI8, 8.0) / tests	7m 26s
DatabaseLive (8.3, OCI8, 8.0) / tests	7m 4s
DatabaseLive (8.5, MySQLi, 8.0) / tests	4m 46s
SeparateProcess (8.4) / tests	3m 29s
DatabaseLive (8.2, SQLite3, 8.0) / tests	3m 16s
DatabaseLive (8.3, SQLSRV, 8.0) / tests	5m 30s
DatabaseLive (8.3, MySQLi, 8.0) / tests	4m 45s
DatabaseLive (8.5, OCI8, 8.0) / tests	6m 53s
DatabaseLive (8.4, SQLite3, 8.0) / tests	2m 34s
DatabaseLive (8.4, Postgre, 8.0) / tests	2m 57s
DatabaseLive (8.2, MySQLi, 5.7) / tests	3m 45s
CacheLive (8.2) / Cache Live Tests	2m 26s
CacheLive (8.5) / Cache Live Tests	2m 18s
DatabaseLive (8.2, Postgre, 8.0) / tests	3m 33s
DatabaseLive (8.4, OCI8, 8.0) / tests	6m 43s
DatabaseLive (8.4, SQLSRV, 8.0) / tests	6m 4s
DatabaseLive (8.3, SQLite3, 8.0) / tests	2m 22s
DatabaseLive (8.3, Postgre, 8.0) / tests	2m 58s
DatabaseLive (8.5, SQLite3, 8.0) / tests	2m 17s
DatabaseLive (8.5, Postgre, 8.0) / tests	2m 47s
Upload coverage results to Coveralls / coveralls	50s
	2h 14m 13s

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