Add dependabot groups, reduce frequency

Author: bickelj

.github/dependabot.yml

@@ -3,10 +3,17 @@ updates:
   - package-ecosystem: "npm"
     directory: "/"
     schedule:
-      interval: "daily"
+      interval: "monthly"
     open-pull-requests-limit: 10
+    groups:
+      eslint:
+        patterns:
+          - '*eslint*'
+      jest:
+        patterns:
+          - '*jest*'
 
   - package-ecosystem: "github-actions"
     directory: ".github/workflows"
     schedule:
-      interval: "daily"
+      interval: "monthly"