Issue #2634: Add `Java8toJava11` #2708

Job	Run time
spotlessCheck rewriteDryRun assemble testClasses	3m 33s
build (maven, 21, ubuntu-latest)	7m 53s
build (maven, 17, windows-latest)	11m 41s
build (maven, 17, ubuntu-latest)	7m 27s
build (gradle, 21, windows-latest)	18m 0s
build (gradle, 21, ubuntu-latest)	8m 40s
build (gradle, 24, windows-latest)	13m 19s
build (maven, 24, ubuntu-latest)	7m 11s
build (gradle, 17, ubuntu-latest)	9m 23s
build (gradle, 24, ubuntu-latest)	7m 52s
build (maven, 24, windows-latest)	11m 59s
build (gradle, 17, windows-latest)	15m 43s
build (maven, 21, windows-latest)	12m 27s
build (idea, 17, ubuntu-latest)	1m 39s
build (shfmt, 17, ubuntu-latest, v3.8.0)	1m 23s
build (npm, 17, ubuntu-latest)	50s
	2h 19m 0s

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