Update Dependabot config: remove labels, reschedule to Tuesday

[Copilot]

Update Dependabot configuration per requirements: remove automatic label assignment and reschedule runs to Tuesday.

Changes

• Removed labels configuration from both npm and github-actions ecosystems
• Changed schedule day from Monday to Tuesday (09:00 Asia/Shanghai)
• Retained existing settings: weekly interval, PR limits (10 for npm, 5 for actions), and dependency grouping

# Before
schedule:
  day: "monday"
labels:
  - "dependencies"
  - "npm"

# After  
schedule:
  day: "tuesday"
# labels section removed

Original prompt

修改dependentbot配置，移除labels配置项，将运行时间改为周二，检查并合理调整其他配置项

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