fix(deps): remove invalid pip update

.github/dependabot.yml

@@ -19,23 +19,3 @@ updates:
     labels:
       - "dependencies"
       - "github-actions"
-
-  # Monitor pip dependencies (for tzst package used in workflow)
-  - package-ecosystem: "pip"
-    directory: "/"
-    schedule:
-      interval: "weekly"
-      day: "monday"
-      time: "02:30"
-      timezone: "UTC"
-    open-pull-requests-limit: 3
-    reviewers:
-      - "xixu-me"
-    assignees:
-      - "xixu-me"
-    commit-message:
-      prefix: "deps"
-      include: "scope"
-    labels:
-      - "dependencies"
-      - "python"