python-can: bump to 1.4.3
Fixes following legal-info issues:
http://autobuild.buildroot.net/results/316/3162ae78c27e174740012851e4a57fcab58ad421//
http://autobuild.buildroot.net/results/087/087b85d9c3e0184be2261912138c1957fe61fae2//
Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>