Untangle Rust crate dependency issue

[danielledeleo]

Caused by:
  no matching package named `suborbital-macro` found
  location searched: registry `crates-io`
  required by package `suborbital v0.13.0 (/Users/cohix-14/Workspaces/suborbital/reactr/api/rust/core/target/package/suborbital-0.13.0)`

cc @cohix