Update smithay to the latest version, for X11 focus leave fix

[mayakwd]

Note
The main intention of this PR is to apply fixes for the upcoming cosmic-comp update and unblock sustainable Unity Editor usage.

What PR does and what doesn't
There are several fixes and additions since the last update made in this PR: #2318

Some of them are pretty straightforward fixes, not requiring any migration, and some are EWMH support additions:
Smithay/smithay@211c19...c0ac123

• The only breaking change that requires migration is the subject of that PR: Prototype a Dispatch2/GlobalDispatch2 trait to dispatch delegate macros to oblivion Smithay/smithay#2008
• Other enhancements, such as wiring EWMH additions, are subject to separate PRs.

This PR addresses exactly the migration from multiple delegate macros to a single delegate_dispatch2.

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[mati865]

This duplicates #2330 but misses some of the changes there.

[mayakwd]

Oh, haven't seen it. Thanks, @mati865! Closing in favor of that PR.