Improve light typing

[cdce8p]

Proposed change

Followup to #78349

Remove some more type ignores. The typing here is correct.
Unfortunately though because of a mypy issue, not all type ignores can be removed.
Ref: python/mypy#13673

/CC: @epenet

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[probot-home-assistant]

Hey there @home-assistant/core, mind taking a look at this pull request as it has been labeled with an integration (light) you are listed as a code owner for? Thanks!
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[epenet]

LGTM