download: Setup default tries and timeout

Currently, we rely on wget default for download tries and timeout. This
can take several minute when the remote server hangs. This setup the
default tries count to 2 and reduce the timeout to 5s.
3 jobs for download-tries-and-timeout in 49 minutes and 31 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Preparation
passed #61934
manifest

00:00:28

 
  Build
passed #61935
cerbero deps fedora x86_64

00:39:35

 
  Full Builds
passed #61936
build cerbero fedora x86_64

00:09:26