Update to 48.0

[nteodosio]

Built fine for ARM and x64: https://launchpad.net/~nteodosio/+snap/gnome-contacts.

[sergio-costas]

@nteodosio It's also possible to remove geocode and libweather parts. Also, a good thing would be to add the _BUILD_FOR piece in the environment variables to avoid warnings from snapcraft.

[nteodosio]

I confirmed the snap builds fine with the candidate's SDK. The build test will inevitably fail until it is promoted to stable.

[sergio-costas]

@nteodosio I think that we can safely add the -dev .debs to allow this to build. It doesn't matter that the SDK will include them in the future. @aleasto what do you think?

[nteodosio]

It's certainly safe. For me either with or without it is OK. @3v1n0 or @aleasto, do you have any strong opinion on it? If not I'll re-apply the last commit and merge it.

[aleasto]

As long as it is guaranteed to be lower or equal version to what's in the gnome runtime, and we don't stage the library here, it's OK.