add eslint group for dependapot (#338)

.github/dependabot.yml

@@ -24,6 +24,10 @@ updates:
           - '@nestjs/common'
           - '@nestjs/platform-express'
           - '@nestjs/testing'
+      eslint:
+        patterns:
+          - '@typescript-eslint/parser'
+          - '@typescript-eslint/eslint-plugin'
     ignore:
       # Causes warnings during dependency resolution (at least in 3.12.x)
       - dependency-name: 'nest-commander'