fix(publish): handle content-length header properly for asset uploads

[travi]

• ensure the local undici instance is used instead of the node built-in
• stop setting content-length manually for asset uploads
• ensure content-length is still set automatically

fixes #1224

[babblebey]

Looks good 😉

My only curious ask is why we were setting the content-length header in the first place... and is it better to no longer set it than to coarse the size value to a string hence meeting the type requirement?? 🤔

[travi]

My only curious ask is why we were setting the content-length header in the first place... and is it better to no longer set it than to coarse the size value to a string hence meeting the type requirement?? 🤔

its unclear to me when this began to be set automatically, so my assumption is that it was necessary originally. since it is automatic now, that is better than us handling it manually

[github-actions]

🎉 This PR is included in version 12.0.9 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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