fix: Remove Dependabot config for root package.json (#10)

Follow-up to #8

As of #8, there is no longer a `package.json` file in this repo’s root
directory. This PR updates Dependabot’s config so it does not check for
updates in a non-existent `package.json`.

Author: smockle

.github/dependabot.yml

@@ -3,10 +3,6 @@
 
 version: 2
 updates:
-  - package-ecosystem: "npm"
-    directory: "/"
-    schedule:
-      interval: "weekly"
   - package-ecosystem: "npm"
     directory: "/.github/actions/find"
     schedule:
@@ -18,4 +14,4 @@ updates:
   - package-ecosystem: "npm"
     directory: "/.github/actions/fix"
     schedule:
-      interval: "weekly"
+      interval: "weekly"