Check for package updates daily

This change may be reverted some day, but for now it looks like
dependabot might be missing some updates and it isn't clear what the
downside of daily will be.

.github/dependabot.yml

@@ -6,7 +6,7 @@ updates:
   - package-ecosystem: "npm"
     directory: "/"
     schedule:
-      interval: "weekly"
+      interval: "daily"
     ignore:
       - dependency-name: "node-fetch"
         update-types: ["version-update:semver-major"]