fix: [CURLRequest] `getHeaderLine('Content-Type')` causes InvalidArgumentException #11425

Job	Run time
Setup PHP Version for Code Coverage	2s
Others (8.2) / Sanity Tests	4m 5s
Others (8.1) / Sanity Tests	3m 6s
Others (8.3) / Sanity Tests	2m 44s
CacheLive (8.1) / Cache Live Tests	2m 36s
CacheLive (8.2) / Cache Live Tests	2m 58s
CacheLive (8.3) / Cache Live Tests	2m 19s
DatabaseLive (8.1, MySQLi, 5.7) / tests	3m 28s
DatabaseLive (8.1, MySQLi, 8.0) / tests	4m 19s
DatabaseLive (8.1, OCI8, 8.0) / tests	6m 7s
DatabaseLive (8.1, Postgre, 8.0) / tests	3m 19s
DatabaseLive (8.1, SQLite3, 8.0) / tests	3m 10s
DatabaseLive (8.1, SQLSRV, 8.0) / tests	4m 26s
DatabaseLive (8.2, MySQLi, 8.0) / tests	5m 33s
DatabaseLive (8.2, OCI8, 8.0) / tests	7m 4s
DatabaseLive (8.2, Postgre, 8.0) / tests	4m 44s
DatabaseLive (8.2, SQLite3, 8.0) / tests	3m 53s
DatabaseLive (8.2, SQLSRV, 8.0) / tests	5m 55s
DatabaseLive (8.3, MySQLi, 8.0) / tests	4m 49s
DatabaseLive (8.3, OCI8, 8.0) / tests	5m 51s
DatabaseLive (8.3, SQLite3, 8.0) / tests	3m 38s
DatabaseLive (8.3, Postgre, 8.0) / tests	3m 1s
DatabaseLive (8.3, SQLSRV, 8.0) / tests	4m 33s
SeparateProcess (8.1) / tests	3m 24s
SeparateProcess (8.2) / tests	4m 17s
SeparateProcess (8.3) / tests	3m 48s
Upload coverage results to Coveralls / coveralls	1m 45s
	1h 44m 54s

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