Update download URL to latest Eclipse JDT version #206

Job	Run time
test (macos-latest, 29.4, false)	3m 5s
test (windows-latest, 28.2, false)	2m 15s
test (ubuntu-latest, 29.4, false)	1m 11s
test (ubuntu-latest, 28.2, false)	1m 11s
test (ubuntu-latest, 30.1, false)	1m 5s
test (macos-latest, 28.2, false)	2m 44s
test (macos-latest, 30.1, false)	2m 31s
test (ubuntu-latest, snapshot, true)	1m 5s
test (windows-latest, 30.1, false)	3m 22s
test (windows-latest, 29.4, false)	2m 32s
test (macos-latest, snapshot, true)	2m 34s
test (windows-latest, snapshot, true)	2m 16s
	25m 51s

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