[CI] Update Dependabot (#352)

Author: jbampton

.github/dependabot.yml

@@ -21,3 +21,12 @@ updates:
           - "*"
     cooldown:
       default-days: 7
+
+  - package-ecosystem: "pre-commit"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    groups:
+      pre-commit-hooks:
+        patterns:
+          - "*"