fix: bump release version and update changelog for public key mapping

[squirer]

Purpose

Create and bump cargo version for releasing public key mapping changes

Changes

bump cargo version and update changelog

Checklist

• My code follows the style of this project.
• The code compiles without warnings.
• I have performed a self-review of the changes.
• I have documented my code, in particular the intent of the
  hard-to-understand areas.
• (If necessary) I have updated the CHANGELOG.

[rbaconcordium]

looks ok