Add new mentors for GSoC projects

The mentor list for some of the projects was
outdated. This updates the list of those mentors.

Author: abhishalya

_projects/generic-bears.md

@@ -9,8 +9,8 @@ initiatives:
 issues: []
 markdown: generic-bears.md
 mentors:
-  - abhsag24
-  - Mixih
+  - abhishalya
+  - sangamcse
 name: "Improve Generic Bear Quality"
 requirements:
   - "The participant should have one bugfix patch to any bear accepted."

_projects/nextgen-action-system.md

@@ -6,8 +6,8 @@ requirements:
  - "The proposal needs to contain a clear concept."
 difficulty: "high"
 mentors:
- - Makman2
- - jayvdb
+ - abhishalya
+ - Vamshi99
 initiatives:
  - GSoC
 status: completed