Upgrade Core-Team and Leaders members

As shown during hackathon 2026 : 
- 3 new core-team members : 
   - Johanna DUIGOU
   - Vianney De BELLABRE
   - Mickaël PICARD
- 3 new main contributors :
   - Benjamin DELAHAIE : Python leader
   - Raphaël UZAN : Python co-leader
   - Thierno DIALLO : Infra Leader