Update dependabot.yml

Author: phip1611

.github/dependabot.yml

@@ -3,15 +3,15 @@ updates:
   - package-ecosystem: cargo
     directory: "/"
     schedule:
-      interval: weekly
+      interval: monthly
     open-pull-requests-limit: 10
     ignore:
       - dependency-name: "*"
         update-types: [ "version-update:semver-patch" ]
   - package-ecosystem: cargo
     directory: "/integration-test/bins"
     schedule:
-      interval: weekly
+      interval: monthly
     open-pull-requests-limit: 10
     ignore:
       - dependency-name: "*"