increase update interval to monthly

Author: peterstadler

.github/dependabot.yml

@@ -8,22 +8,22 @@ updates:
   - package-ecosystem: "github-actions" # See documentation for possible values
     directory: "/" # Location of package manifests
     schedule:
-      interval: "weekly"
+      interval: "monthly"
     labels:
       - "dependencies"
 
   # Enable version updates for npm
   - package-ecosystem: "npm"
     directory: "/"
     schedule:
-      interval: "weekly"
+      interval: "monthly"
     labels:
       - "dependencies"
 
   # Enable version updates for Docker
   - package-ecosystem: "docker"
     directory: "/"
     schedule:
-      interval: "weekly"
+      interval: "monthly"
     labels:
       - "dependencies"