chore: add @shubham-cmyk as a maintainer (#793)

Signed-off-by: Shubham Gupta <[email protected]>

Author: shubham-cmyk

MAINTAINERS.md

@@ -5,5 +5,6 @@ Maintainers are approvers who have shown good technical judgment in guiding feat
 | Maintainer               | GitHub ID                                              | Affiliation               |
 |--------------------------|--------------------------------------------------------|---------------------------|
 | Charles-Edouard Brétéché | [@eddycharly](https://github.com/eddycharly)           | Nirmata                   |
+| Shubham Gupta            | [@shubham-cmyk](https://github.com/shubham-cmyk)       | -                         |
 
 **Note**: Please refer to the [Project Governance](https://kyverno.io/community/#project-governance) for more information on the responsibilities and privileges of a maintainer in `kyverno/chainsaw`.