Make dependabot monthly, at least until it supports bun.lock properly...

Author: tmr232

.github/dependabot.yml

@@ -8,4 +8,5 @@ updates:
   - package-ecosystem: "bun" # See documentation for possible values
     directory: "/" # Location of package manifests
     schedule:
-      interval: "weekly"
+      interval: "monthly"
+enable-beta-ecosystems: true