Add new PGP key ID for Xyne.

Add a new packager key

Details

• Username: Xyne
• PGP key ID: D89FAAEB4CECAFD199A2F5E612C6F735F7A9A519

Related issue: #132

Checks

• All steps in the accompanying ticket are fulfilled.

Main key holders

• The public key has been validated according to the best practices