chore: fix Dependabot pip config to cover all integration packages

The previous pip entry pointed at '/' (root has no Python packages).
Switch to directories: ["integrations/*"] so Dependabot actually scans
all 62 integration pyproject.toml files in the monorepo.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: julian-risch

.github/dependabot.yml

@@ -8,7 +8,8 @@ updates:
       default-days: 1
 
   - package-ecosystem: 'pip'
-    directory: '/'
+    directories:
+      - 'integrations/*'
     schedule:
       interval: 'daily'
     cooldown: