chore: group @typescript-eslint deps in dependabot (#1202)

Group `@typescript-eslint/parser` and `@typescript-eslint/eslint-plugin`
into a single Dependabot PR since they are always versioned together.

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **Chores**
* Added automated grouping for `@typescript-eslint` npm dependency
updates to simplify maintenance.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Author: yogeshchoudhary147

.github/dependabot.yml

@@ -20,3 +20,6 @@ updates:
         patterns:
           - "react"
           - "react-dom"
+      typescript-eslint:
+        patterns:
+          - "@typescript-eslint/*"