dependabot: Group eslint packages (#1479)

Author: reakaleek

.github/dependabot.yml

@@ -17,6 +17,11 @@ updates:
       day: 'monday'
       time: '08:00'
     groups:
+      eslint:
+        patterns:
+          - 'eslint'
+          - '@eslint/*'
+          - 'typescript-eslint'
       eui:
         patterns:
           - '@elastic/eui*'