chore(deps): bump Kong/gateway-test-scheduler from 3 to 4 #33498

Job	Run time
build / Build dependencies	9s
Schedule busted tests to run	10s
Lint and Doc tests	21s
PDK tests	4m 0s
Busted test runner 1	50s
Busted test runner 2	1m 5s
Busted test runner 3	1m 2s
Busted test runner 4	56s
Busted test runner 5	1m 8s
Busted test runner 6	1m 5s
Busted test runner 7	1m 7s
Cleanup and Luacov stats aggregator	0s
	11m 53s

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