fix(spotify): remove User-Agent header

[chaban-mb]

As described in the forum, Spotify is messing with the Open Graph tags. Apparently simply omitting the User-Agent header fixes this problem.

[ROpdebee]

Thanks! Looking good, just some minor issues that CI is complaining about :)

Note to self: We also need to re-generate the saved HTTP responses for the Spotify tests then.

[chaban-mb]

This is my second ever pull request and I never used git and stuff before. So please bear with me if I mess this up. :)

[ROpdebee]

No worries, we all had to start somewhere! 😄 And you didn't mess anything up! 👍

Changes are looking good, it's a shame about having to use an empty string instead of null but if it works, it works 🤷 I looked into it and while it would be possible to change the type definitions to allow null there, it would then lead to type errors in our network request implementation., so I'd prefer to keep it properly typed if possible.

[github-actions]

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