Bump transmission-rpc to 4.1.5

[Mic92]

Changelog:

https://github.com/trim21/transmission-rpc/releases/tag/v4.0.0
https://github.com/trim21/transmission-rpc/releases/

Breaking change

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• Dependency upgrade
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[home-assistant]

Hey there @engrbm87, @JPHutchins, mind taking a look at this pull request as it has been labeled with an integration (transmission) you are listed as a code owner for? Thanks!

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[cgarwood]

Please include a link to the changelog or release notes for the dependency in the PR description.

[home-assistant]

Please take a look at the requested changes, and use the Ready for review button when you are done, thanks 👍

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