Fix CI actions to make them run and update against Ubuntu.

[atorkmabrains]

Fixes #23: Added commands to update the version of Ubuntu in the CI actions to allow proper installation of Klayout.

• [ ] Tests pass

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[atorkmabrains]

@mithro ok.

[mithro]

I'm going to merge this on the assumption that the last test will succeed.

[atorkmabrains]

Thanks @mithro