Group Dependabot security updates for uv dependencies (#3611)

Author: Kludex

.github/dependabot.yml

@@ -10,6 +10,10 @@ updates:
       python-packages:
         patterns:
           - "*"
+      python-security:
+        applies-to: security-updates
+        patterns:
+          - "*"
   - package-ecosystem: "github-actions"
     directory: "/"
     schedule: