Bump dependencies

[danyeaw]

No description provided.

[danyeaw]

@amolenaar The build for this is currently failing due to the install-schemas step. Any thoughts on what we should do about this? Some potential options:

1. Install Gaphor from source and then run poe install-schemas
2. Remove the gaphor --self-test check in CI for this repo
3. Change the gaphor --self-test to allow ignoring that schemas aren't installed
4. Try to test this with a Flatpak version of the app

[amolenaar]

Not having the schemas installed makes the self test kinda useless outside of our packaged versions.

For now I think it's okay to skip the self test step.

Maybe we should bundle the schemas with the pypi package and provide a gaphor install-schemas cli command?