[Merge] ~nteodosio/update-manager:jammy-ua into update-manager:ubuntu/jammy

[Sebastien Bacher]

We should probably make it a GResource (https://docs.gtk.org/gio/struct.Resource.html) going forward, which would make it included in the binary, but that's not going to fix that case today where upgrading from a previous version where it was not
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https://code.launchpad.net/~nteodosio/update-manager/+git/update-manager/+merge/457139
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