Update the dependabot configuration for restored cargo-workspace (#229)

Minor fix missed in #228

Author: termoshtt

.github/dependabot.yml

@@ -15,20 +15,14 @@ updates:
           - "*"
 
   - package-ecosystem: "cargo"
-    directories:
-      - "/"
-      - "/examples/mixed"
-      - "/examples/mixed_sub"
-      - "/examples/mixed_sub_multiple"
-      - "/examples/pure"
+    directory: "/"
     schedule:
       interval: "weekly"
     allow:
       - dependency-type: "all"
     ignore:
       - dependency-name: "pyo3"
       - dependency-name: "numpy"
-      - dependency-name: "pyo3-build-config"
     groups:
       dependencies:
         patterns: