Require ESPHome 2026.8.0 for channel_colors

[bharvey88]

Version: 26.8.27.1

What does this implement/fix?

H-3 already uses channel_colors on the LED chain, but both device YAMLs still
declared min_version: 2025.11.0. channel_colors only exists from ESPHome
2026.8.0 (esphome#18474), so an
adopter on an older ESPHome hits Unknown option channel_colors inside
Core.yaml instead of a clear version error. ESPHome checks min_version in the
preload phase, before component schemas load, so the bump surfaces the right
message.

No firmware change: min_version is validation-only and emits no code.

Brings H-3 in line with the rest of the fleet, which moved to 2026.8.0 alongside
the channel_colors migration.

Types of changes

• Bugfix (fixed change that fixes an issue)
• New feature (thanks!)
• Breaking change (repair/feature that breaks existing functionality)
• Dependency Update - Does not publish
• Other - Does not publish
• Website of github readme file update - Does not publish
• Github workflows - Does not publish

Checklist / Checklijst:

• The code change has been tested and works locally
• The code change has not yet been tested

If user-visible functionality or configuration variables are added/modified:

• Added/updated documentation for the web page

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