meson: don't add sources files as a dependency to the gresource

This was causing issues when we build the app with the pkg.name set to the app-id
By following what is already done on Weather, this can be fixed by not adding those files as a dependency
3 jobs for <span class="ref-name">resources</span> in 1 minute and 1 second
Status Job ID Name Coverage
  Test
passed #206073
flatpak

00:00:36

 
  Deploy
passed #206074
review

00:00:24

manual #206075
allowed to fail manual
stop_review