Switch Dependabot to monthly with limited open PRs

Author: Varnasr

.github/dependabot.yml

@@ -3,19 +3,13 @@ updates:
   - package-ecosystem: "pip"
     directory: "/"
     schedule:
-      interval: "weekly"
-    labels:
-      - "dependencies"
-      - "python"
-    commit-message:
-      prefix: "pip"
-
+      interval: "monthly"
+    labels: ["dependencies","python"]
+    open-pull-requests-limit: 2
   - package-ecosystem: "github-actions"
     directory: "/"
     schedule:
-      interval: "weekly"
-    labels:
-      - "dependencies"
-      - "ci"
-    commit-message:
-      prefix: "actions"
+      interval: "monthly"
+    labels: ["dependencies","ci"]
+    open-pull-requests-limit: 2
+