Update dependabot schedule interval (#666)

Update dependabot interval

Signed-off-by: Cintia Sánchez García <cynthiasg@icloud.com>

Author: cynthia-sg

.github/dependabot.yml

@@ -3,7 +3,7 @@ updates:
   - package-ecosystem: "cargo"
     directory: "/"
     schedule:
-      interval: "weekly"
+      interval: "monthly"
     groups:
       backend:
         patterns:
@@ -15,7 +15,7 @@ updates:
   - package-ecosystem: "github-actions"
     directory: "/"
     schedule:
-      interval: "weekly"
+      interval: "monthly"
     groups:
       github-actions:
         patterns:
@@ -24,10 +24,10 @@ updates:
   - package-ecosystem: "docker"
     directory: "/"
     schedule:
-      interval: "weekly"
+      interval: "monthly"
 
   - package-ecosystem: "docker"
     directory: "/database/migrations"
     schedule:
-      interval: "weekly"
+      interval: "monthly"