style: Use description color instead of disabled in Empty

[evgmol]

🤔 This is a ...

Component style update

💡 Background and solution

Imo, using the disabled color for description makes the text to be way too light: as a user I think it's not readable enough. And it does not comply with a11y guidelines.

📝 Changelog

The description text for empty states has become slightly darker

Language	Changelog
🇺🇸 English	The description text for empty states has become slightly darker
🇨🇳 Chinese	空状态的描述文本变得稍微暗一些

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[github-actions]

Visual Regression Report for PR #47268 Failed ❌

Target branch: master (057e81f)
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---

image name	expected	actual	diff
cascader-panel.compact.png
cascader-panel.compact.css-var.png
cascader-panel.dark.png
cascader-panel.dark.css-var.png
cascader-panel.default.png
cascader-panel.default.css-var.png
config-provider-locale.compact.png
config-provider-locale.compact.css-var.png
config-provider-locale.dark.png
config-provider-locale.dark.css-var.png

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (057e81f) 100.00% compared to head (3a2ed69) 100.00%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master    #47268   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          732       732           
  Lines        12563     12563           
  Branches      3296      3296           
=========================================
  Hits         12563     12563           

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