Remove Jenkinsfile elifesciences/issues#9002 #4

Job	Run time
tests (7.1, test)	1m 14s
tests (7.1, test-lowest)	1m 27s
tests-future-versions (8, test)	16s
tests (7.2, test)	1m 4s
tests-future-versions (8, test-lowest)	16s
tests (7.2, test-lowest)	1m 21s
tests-future-versions (8.1, test)	14s
tests (7.3, test)	35s
tests-future-versions (8.1, test-lowest)	16s
tests (7.3, test-lowest)	54s
tests-future-versions (8.2, test)	18s
tests (7.4, test)	34s
tests-future-versions (8.2, test-lowest)	17s
tests (7.4, test-lowest)	52s
tests-future-versions (8.3, test)	18s
tests-future-versions (8.3, test-lowest)	16s
	10m 12s

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