chore(deps): update actions/checkout action to v6

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/checkout	action	major	v5 -> v6

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Release Notes

actions/checkout (actions/checkout)

v6

Compare Source

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Configuration

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Project	Deployment	Preview	Comments	Updated (UTC)
vue-echarts	Ready	Preview	Comment	Dec 1, 2025 1:07am

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.96%. Comparing base (50669c8) to head (79779c2).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #948   +/-   ##
=======================================
  Coverage   94.96%   94.96%           
=======================================
  Files           9        9           
  Lines         318      318           
  Branches       38       38           
=======================================
  Hits          302      302           
  Misses         16       16           

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commit: 79779c2