"The Poetry configuration is invalid" - Extras should only list names, not include versions

[charles-dyfis-net]

Using Poetry 1.5.1:

Reading the documentation, items included in extras should only include names, with the versions specified via entries in tool.poetry.dependencies having optional = true set to suppress default installation.

Expected Behavior

I am attempting to successfully install dependencies with Poetry (as a prerequisite to building a PR using poetry2nix).

Current Behavior

$ poetry build

The Poetry configuration is invalid:
  - [extras.server.0] 'uvicorn>=0.22.0' does not match '^[a-zA-Z-_.0-9]+$'
  - [extras.server.1] 'fastapi>=0.100.0' does not match '^[a-zA-Z-_.0-9]+$'
  - [extras.server.2] 'pydantic-settings>=2.0.1' does not match '^[a-zA-Z-_.0-9]+$'
  - [extras.server.3] 'sse-starlette>=1.6.1' does not match '^[a-zA-Z-_.0-9]+$'

Environment and Context

Poetry 1.5.1, as installed via the current master branch of nixpkgs (see https://nixos.org/). Reproducible both on MacOS (aarch64) and Linux.

Failure Information (for bugs)

Please help provide information about the failure if this is a bug. If it is not a bug, please remove the rest of this template.

Steps to Reproduce

Run poetry build on a newly checked out source tree.