Fix Dependabot syntax.

Author: alexdlaird

.github/dependabot.yml

@@ -1,11 +1,11 @@
 version: 2
 updates:
   - package-ecosystem: "pip"
+    # Project not actively developed, so only open security updates: https://docs.github.com/en/code-security/dependabot/working-with-dependabot/dependabot-options-reference#open-pull-requests-limit
+    open-pull-requests-limit: 0
     directory: "/"
     schedule:
       interval: "weekly"
       day: "monday"
       time: "05:00"
-      timezone: "America/Chicago"
-  # Project not actively developed, so only open security updates: https://docs.github.com/en/code-security/dependabot/working-with-dependabot/dependabot-options-reference#open-pull-requests-limit
-  - open-pull-requests-limit: 0
+      timezone: "America/Chicago"