`bdk_testenv` docs are not building on docs.rs

[evanlinjin]

Describe the bug

https://docs.rs/bdk_testenv

In docs.rs sandboxed build environment, network access is blocked.

[riverKanies]

pr for potential fix #1679

[notmandatory]

Fixed by #1722

[riverKanies]

Fixed by #1722

@notmandatory this won't be confirmed until docs.rs rebuilds bdk. Looks like that won't happen automatically until a new release, but looks like we can create an issue to request a rebuild https://github.com/rust-lang/docs.rs/issues/new?template=crate-build-failure.yaml

[notmandatory]

We'll verify this solved the problem with the upcoming 1.0.0-beta.6, if it doesn't fix it for some reason we'll re-open this issue and fix it in a 1.0.1 patch release.