Add Java 26-ea to Maven workflow matrix #1613

Job	Run time
build (ubuntu-latest, 25, temurin)	18m 21s
build (ubuntu-latest, 26-ea, temurin)	17m 54s
build (ubuntu-latest, 17, temurin)	23m 28s
build (ubuntu-latest, 21, temurin)	22m 51s
build (ubuntu-latest, 21, temurin)	22m 51s
build (ubuntu-latest, 26-ea, temurin)	17m 57s
build (ubuntu-latest, 17, temurin)	23m 28s
build (ubuntu-latest, 25, temurin)	18m 21s
	2h 45m 11s

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