[PATCH kexec-tools] github: run apt-get update before installing packages

[Simon Horman]

On Wed, Mar 23, 2022 at 03:02:20PM +0100, Simon Horman wrote:
> Refresh package database before installing dependencies to avoid failures
> due to trying to install older, no longer available, versions of packages.
> 
> Signed-off-by: Simon Horman <horms at verge.net.au>

Applied.