Lukas Fleischer b0d94d4e84 Update apt index in GitHub workflow
Run `apt-get update` for Ubuntu to fix errors seen because of an
out-of-date index:

    E: Failed to fetch [...]  404  Not Found [IP: 40.119.46.219 80]
    E: Failed to fetch [...]  404  Not Found [IP: 40.119.46.219 80]
    E: Failed to fetch [...]  404  Not Found [IP: 40.119.46.219 80]

Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>
2023-04-15 13:28:34 -04:00
..
2023-04-15 13:28:34 -04:00