Update tgfx to b8251c0d and adapt to new GPU API for instanced drawing support.

[domchen]

更新 tgfx 子模块至最新版本 b8251c0d，适配新的 GPU 绘制 API，支持实例化绘制功能。

[Copilot]

Pull request overview

This PR updates the tgfx submodule to commit b8251c0d and adapts the codebase to accommodate breaking changes in the GPU rendering API that introduce support for instanced drawing.

Changes:

• Updated tgfx dependency to version b8251c0d
• Migrated vertex descriptor API to use buffer layouts array structure
• Updated setVertexBuffer call to accept buffer index parameter
• Changed draw method call to use explicit uint32_t cast for vertex count

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
DEPS	Updates tgfx submodule commit hash to b8251c0d
src/rendering/filters/RuntimeFilter.cpp	Adapts to new tgfx GPU API by updating vertex descriptor initialization, setVertexBuffer call signature, and draw method parameter type

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.17%. Comparing base (ea3d023) to head (7380a63).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3224      +/-   ##
==========================================
- Coverage   77.21%   77.17%   -0.05%     
==========================================
  Files         413      413              
  Lines       21910    21910              
  Branches     6291     6292       +1     
==========================================
- Hits        16918    16908      -10     
- Misses       3802     3805       +3     
- Partials     1190     1197       +7     

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