Add support for Java 25 in egg-java.json

[rakeshbethu2102]

#Summary
Adds support for the existing Java 25 (J25) yolk to the Generic Java egg so it can be selected from the Pterodactyl panel.

Reason

A Java 25 yolk already exists, but the Generic Java egg does not expose it in docker_images, preventing users from selecting it.

Changes

• Added ghcr.io/ptero-eggs/yolks:java_25 to the Generic Java egg docker images list. .

Description

Checklist for all submissions

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?
• Have you tested and reviewed your changes with confidence that everything works?
• Did you branch your changes and PR from that branch and not from your master branch?
  • If not, why?:

• You verify that the start command applied does not use a shell script
  • If some script is needed then it is part of a current yolk or a PR to add one
• The egg was exported from the panel

New egg Submissions

1. Does your submission pass tests (server is connectable)?
2. Does your egg use a custom docker image?
   • Have you tried to use a generic image?
   • Did you PR the necessary changes to make it work?
3. Have you added the egg to the main README.md and any other README files in subdirectories of the egg according to the alphabetical order?
4. Have you added a unique README.md for the egg you are adding according to the alphabetical order?
5. You verify that the start command applied does not use a shell script
   • If some script is needed then it is part of a current yolk or a PR to add one
6. The egg was exported from the panel