Update dependabot.yml

Author: tkoyama010

.github/dependabot.yml

@@ -3,8 +3,6 @@ updates:
   - package-ecosystem: "pip"
     directory: "/"
     insecure-external-code-execution: allow
-    schedule:
-      interval: "monthly"
     open-pull-requests-limit: 100
     labels:
       - "maintenance"
@@ -15,8 +13,6 @@ updates:
           - "*"
   - package-ecosystem: "github-actions"
     directory: "/"
-    schedule:
-      interval: "monthly"
     open-pull-requests-limit: 100
     labels:
       - "maintenance"