Add dependabot entry for pre-commit

Author: nateprewitt

.github/dependabot.yml

@@ -1,13 +1,19 @@
 version: 2
 updates:
-  - package-ecosystem: github-actions
-    directory: /
+  - package-ecosystem: "github-actions"
+    directory: "/"
     schedule:
-      interval: weekly
+      interval: "weekly"
     ignore:
       # Ignore all patch releases as we can manually
       # upgrade if we run into a bug and need a fix.
       - dependency-name: "*"
         update-types: ["version-update:semver-patch"]
     cooldown:
       default-days: 7
+  - package-ecosystem: "pre-commit"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    cooldown:
+      default-days: 7