Make spotify update interval dynamic

[joostlek]

Proposed change

Make spotify update interval dynamic, since we know when a track is expected to end, so if we schedule our update just after the track has ended, we can be more accurate

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• This PR fixes or closes issue: fixes #
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[home-assistant[bot]]

Hey there @frenck, mind taking a look at this pull request as it has been labeled with an integration (spotify) you are listed as a code owner for? Thanks!

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[luca-angemi]

What happens if you skip to the next song?

[joostlek]

If you skip a song it will just have the regular interval. I'd rather make it like this than set the update interval lower. With this logic we would at least refresh at a moment we know when there is new data