Bump gaphas from 3.0.0b2 to 3.0.0b3 (#564)
Bump gaphas from 3.0.0b2 to 3.0.0b3 (#564)

Bumps [gaphas](https://github.com/gaphor/gaphas) from 3.0.0b2 to 3.0.0b3.
- [Release notes](https://github.com/gaphor/gaphas/releases)
- [Changelog](https://github.com/gaphor/gaphas/blob/master/NEWS)
- [Commits](https://github.com/gaphor/gaphas/compare/3.0.0-beta.2...3.0.0-beta.3)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>

Co-authored-by: dependabot[bot] <1c358da00a777d4e9898c1280ab801e2df165188@users.noreply.github.com>
amolenaar/gaphor,amolenaar/gaphor