Temporarily fix upgrade tests #2885

Job	Run time
detect	1s
build-toolkit	2m 1s
build-matrix (green) / detect	12s
build-matrix (green) / build-os	3m 24s
build-matrix (green) / build-disk	20s
build-matrix (green) / build-iso	13s
build-matrix (green) / test-installer	13m 31s
build-matrix (green) / tests-matrix (test-upgrade)	15m 0s
build-matrix (green) / tests-matrix (test-downgrade)	14m 7s
build-matrix (green) / tests-matrix (test-recovery)	15m 58s
build-matrix (green) / tests-matrix (test-fallback)	19m 2s
build-matrix (green) / tests-matrix (test-fsck)	17m 15s
build-matrix (green) / tests-matrix (test-grubfallback)	13m 8s
	1h 54m 12s

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