[dependabot.yml] Add group for eslint (#423)

Author: mikeharder

.github/dependabot.yml

@@ -22,3 +22,7 @@ updates:
 
       # Locked to "^20.0.0" to align with our minimum node version in package.json/engines
       - dependency-name: "@types/node"
+    groups:
+      eslint:
+        patterns:
+          - "*eslint*"