increase NUM_NO_REPLY_UNTIL_UNRESPONSIVE to 6 #27714

Job	Run time
build (check_format)	1m 9s
build (check_newlines)	1m 37s
build (tests)	5m 35s
build (tests_coverage)	7m 13s
build (px4_fmu-v2_default stack_check)	3m 17s
build (validate_module_configs)	53s
build (shellcheck_all)	1m 43s
build (NO_NINJA_BUILD=1 px4_fmu-v5_default)	4m 6s
build (NO_NINJA_BUILD=1 px4_sitl_default)	3m 11s
build (px4_sitl_allyes)	4m 34s
build (module_documentation)	58s
	34m 16s

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