readme/release: update sponsors

Author: jknack

.github/workflows/maven-central.yml

@@ -196,7 +196,6 @@ jobs:
 
           ### 🏆 Sponsors
           - [@premium-minds](https://github.com/premium-minds)
-          - [@agentgt](https://github.com/agentgt)
           - [@tipsy](https://github.com/tipsy)
           EOF
 

README.md

@@ -79,7 +79,6 @@ sponsors
 | Logo                                                                                                                                   | Sponsor                                           |
 |----------------------------------------------------------------------------------------------------------------------------------------|---------------------------------------------------|
 | <img src="https://github.com/user-attachments/assets/4a3f519e-0b2e-4bb4-b2eb-624b05720e31" alt="Premium Minds" width="32" height="32"> | [@premium-minds](https://github.com/premium-minds) |
-| <img src="https://avatars.githubusercontent.com/u/567706?v=4" alt="Adam Gent" width="32" height="32">     | [@agentgt](https://github.com/agentgt)                     |
 | <img src="https://github.com/user-attachments/assets/51073649-6cba-4e7b-8eee-8c05f4b9648e" alt="David" width="32" height="32">         | [@tipsy](https://github.com/tipsy)                |
 
 Previous version