fix: specify duplex option

[achingbrain]

A recent change to the fetch spec means the duplex option has to be set to half when using a ReadbleStream as the request body.

[github-actions[bot]]

:tada: This PR is included in version 9.0.10 :tada:

The release is available on:

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

Your semantic-release bot :package::rocket: