configure dependabot

.github/dependabot.yml

@@ -21,6 +21,23 @@ updates:
         versions: [">=16.0.0"]
       # we ignore TS as a part of quarterly dependency updates.
       - dependency-name: "typescript"
+    allow:
+      - dependency-type: "development"
+
+    groups:
+      development-dependencies:
+        dependency-type: "development"
+        applies-to: version-updates
+        update-types:
+        - "minor"
+        - "patch"
+
+  - package-ecosystem: "cargo" # See documentation for possible values
+    directory: "/" # Location of package manifests
+    schedule:
+      interval: "monthly"
+    allow: 
+      - dependency-type: "development"
 
     groups:
       development-dependencies: