Ladok3

Bumps cryptography version

**Full Changelog**: https://github.com/dbosk/ladok3/compare/v4.7...v4.9

Bumps depends' versions

**Full Changelog**: https://github.com/dbosk/ladok3/compare/v4.6...v4.7

Improves error handling when there are no credentials

**Full Changelog**: https://github.com/dbosk/ladok3/compare/v4.5...v4.6

Bugfix: Add check if credentials is None


**Full Changelog**: https://github.com/dbosk/ladok3/compare/v4.4...v4.5

Complements bugfix in v4.3.

**Full Changelog**: https://github.com/dbosk/ladok3/compare/v4.3...v4.4

- Error-handles if keyring doesn't exist
- Updates keyring version to sync with `canvaslms` (due to security)
- Updates cryptography depend due to security


**Full Changelog**: https://github.com/dbosk/ladok3/compare/v4.2...v4.3