Fix playwright test workflow ubuntu version

[mickmister]

This PR fixes an issue with the Ubuntu version running in CI. This has started happening yesterday or a few days ago according to the linked discussion.

GitHub discussion with solution
https://github.com/orgs/community/discussions/120966

---

CI error
https://github.com/mattermost/mattermost-plugin-todo/actions/runs/8815297151/job/24197305810?pr=251

Hit:21 https://ppa.launchpadcontent.net/ubuntu-toolchain-r/test/ubuntu jammy InRelease
Reading package lists...
E: Failed to fetch https://packages.microsoft.com/ubuntu/22.04/prod/dists/jammy/InRelease  Clearsigned file isn't valid, got 'NOSPLIT' (does the network require authentication?)
E: The repository 'https://packages.microsoft.com/ubuntu/22.04/prod jammy InRelease' is no longer signed.
Failed to install browsers
Error: Installation process exited with code: 100
Error: Process completed with exit code 1.