Use the same build parameters as the gtk-rust-template

Maximiliano requested to merge msandova/metronome:fix-build into master

This MR is basically housekeeping. Over time the practices regarding how rust apps are packaged have been revisited over and over this MR makes use of the latter stuff used int he gtk-rust-template.

We also use stable releases of the the gtk-rs stack, this somehow fixes the build at flathub.

Edited by Maximiliano

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