fix: bcovrin interaction with ledger

Description

Update AFJ to 0.4.0 stable. This resolves the issue of not able to issue credential without errors.

Related issues

Testing

Checklist

• I have updated the documentation (if necessary)
• I have added unit tests for new functionality (if applicable)
• My code follows the style guidelines of this project
• I have tested this code on my local machine before submitting this MR

Reviewers

• @alexey.lunin
• @boyan.tsolov

Additional Notes

Still works strange. With a fresh wallet and did it works. Tried to way for some time, like day and a half still works.

Closes #21 (closed)