security/py-service_identity: Mark DEPRECATED and set EXPIRATION_DATE to 2024-01-31

- While I'm here, fix path (devel/ -> security/)

PR:		275167
Reported by:	John Hein <jcfyecrayz@liamekaens.com>
Approved by:	Axel Rau <axel.rau@chaos1.de> (maintainer)