Add Dependabot monthly groups

Author: Copilot

.github/dependabot.yml

@@ -0,0 +1,34 @@
+version: 2
+updates:
+  - package-ecosystem: cargo
+    directory: /
+    schedule:
+      interval: monthly
+    groups:
+      cargo-dependencies:
+        patterns:
+          - "*"
+    cooldown:
+      default-days: 7
+
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: monthly
+    groups:
+      github-actions-dependencies:
+        patterns:
+          - "*"
+    cooldown:
+      default-days: 7
+
+  - package-ecosystem: pip
+    directory: /
+    schedule:
+      interval: monthly
+    groups:
+      python-dependencies:
+        patterns:
+          - "*"
+    cooldown:
+      default-days: 7