printrun: rename cython_3 to cython #1159

Job	Run time
Get list of packages to build	27s
Build esp-rust-bin	1m 31s
Build plasma5-wallpapers-dynamic	1m 7s
Build breeze-enhanced	29s
Build ksysguard	1m 27s
Build thermalmonitor	39s
Build easyeffects_7_0_4	4m 41s
Build phinger-cursors	32s
Build vkcube	26s
Build plasma-applet-thermal-monitor	39s
Build ckan	21m 1s
Build printrun	44s
Build squeak_4_10	1m 30s
Build scratch-unwrapped	1m 32s
Build litedram	28s
Build cargo-espflash	1m 15s
Build klassy	2m 32s
Build scratch	1m 51s
Build nextpnr-unstable	29m 58s
Build tailscale-systray	29s
Wait for build(s) to succeed	1s
	1h 13m 19s

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