Bump flux_led to 0.27.28 to fix missing white channel on SK6812RGBW strips

[bdraco]

Proposed change

• Fixes missing white channel on SK6812RGBW strips

• Adjust buggy firmware turn on workaround to reduce chance of device flash at turn on

• Changelog: lightinglibs/flux_led@0.27.21...0.27.28

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: closes FluxLED / MagicHome turns on LED strip twice 0x06 device firmware v1 #63144 and fixes https://community.home-assistant.io/t/configure-flux-led-to-rgbw-with-addressable-v3-controller/374966
• This PR is related to issue:
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the development checklist
• The code has been formatted using Black (black --fast homeassistant tests)
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io

If the code communicates with devices, web services, or third-party tools:

• The manifest file has all fields filled out correctly.
  Updated and included derived files by running: python3 -m script.hassfest.
• New or updated dependencies have been added to requirements_all.txt.
  Updated by running python3 -m script.gen_requirements_all.
• For the updated dependencies - a link to the changelog, or at minimum a diff between library versions is added to the PR description.
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[probot-home-assistant]

Hey there @icemanch, mind taking a look at this pull request as it has been labeled with an integration (flux_led) you are listed as a code owner for? Thanks!
_{^{(message by CodeOwnersMention)}}

[frenck]

Thanks, @bdraco 👍

Happy New Year 🍾