workflows: Update package list on ubuntu64*
workflows: Update package list on ubuntu64*

Apparently Ubuntu may also drop package versions in LTS
distros, so always run "apt-get update" before trying to
install packages.

Signed-off-by: Gert Wollny <a4abb7b2c48b4038af2f307a789969b4cce91ae7@collabora.com>

apitrace/apitrace,apitrace/apitrace,apitrace/apitrace,apitrace/apitrace