For Wayland, run testbed on Ubuntu 24.04

[rmartin16]

Changes

• Closes Intermittent CI failure on linux-wayland testbed #2871
• When I use a newer version of mutter locally, the issue goes away...
• Seven successful runs with Ubuntu 24.04

PR Checklist:

• All new features have been tested
• All new features have been documented
• I have read the CONTRIBUTING.md file
• I will abide by the code of conduct

[rmartin16]

well, this is one option; it does require building a wheel for Pillow each time...but it works 😅

[freakboy3742]

well, this is one option; it does require building a wheel for Pillow each time...but it works 😅

Ah- that's because we've pinned such an old version of Pillow. Upgrading the pinned Pillow version is on the todo list; Android wheels are the sticking point. In the meantime, a pillow build is annoying, but isn't that onerous - and it's a lot less annoying that having 50% of Toga CI runs fail.

The other annoying inconsistency is that this means the GTK tests are running on 3.12, rather than 3.10 as they are for every other platform. My inclination is to roll back the linux-x11 change to stay on 22.04 for that reason - that also lets us avoid the Pillow build until we can bump the pinned version.

It looks like there was a new version of mutter published in September, so the emergence of this problem looks like it could be consistent with that version update.

[rmartin16]

Sounds good; I reverted the changes for linux-x11 testbed to continue using Ubuntu 22.04.

[freakboy3742]

I'm going to call this a win. Congrats on a nice bit of debugging.