[GR-58041] Use mx 7.30.0. #19174

Job	Run time
/substratevm on Windows	7m 29s
/compiler style,fullbuild,test JDK21	28m 10s
/compiler build,bootstraplite JDKlatest	4m 22s
/espresso style,fullbuild JDK21	12m 59s
/substratevm style,fullbuild JDK21	10m 39s
/substratevm build,helloworld,native_unittests JDKlatest	19m 37s
/substratevm build,debuginfotest JDKlatest	7m 59s
/substratevm hellomodule JDKlatest	4m 59s
/sulong style,fullbuild,sulongBasic JDK21	19m 56s
/truffle JDK21	27m 55s
/vm build,sulong JDKlatest	26m 25s
/vm build JDKlatest	15m 32s
	3h 6m 2s

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