Enable dependabot support for precommit hooks

See dependabot/dependabot-core#1524

Author: jenshnielsen

.github/dependabot.yml

@@ -1,4 +1,5 @@
 version: 2
+enable-beta-ecosystems: true
 updates:
 - package-ecosystem: pip
   directory: "/"
@@ -36,3 +37,8 @@ updates:
   directory: /.github
   schedule:
     interval: daily
+
+- package-ecosystem: "pre-commit"
+  directory: "/"
+  schedule:
+    interval: daily