CI: Delete some unused packages to have more disk space available. #113

Job	Run time
miri	58s
build (ubuntu, stable, locked, true)	1h 4m 53s
build (windows, stable, locked, false)	31m 25s
build (macos, stable, locked, false)	18m 31s
build (ubuntu, nightly, locked, false)	14m 15s
build (ubuntu, beta, locked, false)	12m 43s
build (ubuntu, stable, latest, false)	25m 8s
build (ubuntu, stable, minimal, false)	15m 56s
fuzz	18m 42s
deploy	0s
	3h 22m 31s

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