Bump actions/cache from 3 to 4 #295

Job	Run time
Test PHP 8.0 using broker [mosquitto-1.6]	1m 40s
Test PHP 8.0 using broker [mosquitto-2.0]	1m 38s
Test PHP 8.0 using broker [hivemq]	2m 1s
Test PHP 8.0 using broker [emqx]	2m 2s
Test PHP 8.0 using broker [rabbitmq]	5m 49s
Test PHP 8.1 using broker [mosquitto-1.6]	1m 52s
Test PHP 8.1 using broker [mosquitto-2.0]	1m 42s
Test PHP 8.1 using broker [hivemq]	1m 58s
Test PHP 8.1 using broker [emqx]	2m 13s
Test PHP 8.1 using broker [rabbitmq]	5m 40s
Test PHP 8.2 using broker [mosquitto-1.6]	1m 40s
Test PHP 8.2 using broker [mosquitto-2.0]	1m 38s
Test PHP 8.2 using broker [hivemq]	2m 9s
Test PHP 8.2 using broker [emqx]	2m 4s
Test PHP 8.2 using broker [rabbitmq]	5m 52s
Test PHP 8.3 using broker [mosquitto-1.6]	1m 46s
Test PHP 8.3 using broker [mosquitto-2.0]	2m 10s
Test PHP 8.3 using broker [hivemq]	1m 53s
Test PHP 8.3 using broker [emqx]	1m 59s
Test PHP 8.3 using broker [rabbitmq]	5m 51s
	53m 37s

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