Change Dependabot update schedule to quarterly

Author: stefanb

.github/dependabot.yml

@@ -11,16 +11,16 @@ updates:
   - package-ecosystem: "npm" # See documentation for possible values
     directory: "/" # Location of package manifests
     schedule:
-      interval: "monthly"
+      interval: "quarterly"
     open-pull-requests-limit: 10
 
   - package-ecosystem: "docker" # See documentation for possible values
     directory: "/" # Location of package manifests
     schedule:
-      interval: "monthly"
+      interval: "quarterly"
     open-pull-requests-limit: 10
 
   - package-ecosystem: "github-actions" # See documentation for possible values
     directory: "/" # Location of package manifests
     schedule:
-      interval: "monthly"
+      interval: "quarterly"