Run dependabot monthly

Signed-off-by: Philipp Trulson <[email protected]>

.github/dependabot.yml

@@ -3,7 +3,7 @@ updates:
   - package-ecosystem: github-actions
     directory: /
     schedule:
-      interval: weekly
+      interval: monthly
     groups:
       actions-minor:
         update-types:
@@ -13,7 +13,7 @@ updates:
   - package-ecosystem: npm
     directory: /
     schedule:
-      interval: weekly
+      interval: monthly
     groups:
       npm-development:
         dependency-type: development