Poetry update can't solve a Python 3.9+ project with JUST pytest as a dev dependency... what is going on here?

poetry.toml

[virtualenvs]
create = false

poetry_update_stalls.txt

# 1. Create a pyprojct.toml file by hand using pip requirements.
#    Then remove everything except pytest when it won't update - takes overnight and no solution.

$ poetry update

Loading configuration file /home/rjurney/.config/pypoetry/config.toml
Loading configuration file /home/rjurney/Software/my-streamlit/poetry.toml
Using virtualenv: /home/rjurney/anaconda3/envs/my-streamlit
Updating dependencies
Resolving dependencies...
   1: fact: my-streamlit is 0.1.0
   1: derived: my-streamlit
   1: fact: my-streamlit depends on pytest (>=7.3.0)
   1: selecting my-streamlit (0.1.0)
   1: derived: pytest (>=7.3.0)
[keyring.backend] Loading KWallet
[keyring.backend] Loading SecretService
[keyring.backend] Loading Windows
[keyring.backend] Loading chainer
[keyring.backend] Loading libsecret
[keyring.backend] Loading macOS

# WAIT TILL THE END OF TIME

pyproject.toml

[tool.poetry]
name = "my-streamlit"
version = "0.1.0"
description = "My Project."
authors = ["Russell Jurney <russell.jurney@gmail.com>"]
readme = "README.md"
packages = [{include = "my_streamlit"}]

[tool.poetry.dependencies]
python = "^3.9"

[tool.poetry.dev-dependencies]
pytest = ">=7.3.0"

[build-system]
requires = ["poetry-core"]
build-backend = "poetry.core.masonry.api"

[tool.black]
line-length = 100
target-version = ["py310"]
include = ["my_streamlit", "test"]

[tool.isort]
profile = "black"
src_paths = ["my_streamlit", "test"]

[tool.mypy]
python_version = "3.10"
mypy_path = ["my_streamlit", "test"]
ignore_missing_imports = true

versions.txt

# Poetry version
Poetry (version 1.4.1)

# Python version
Python 3.10.10

# OS version
Distributor ID:	Ubuntu
Description:	Ubuntu 20.04.6 LTS
Release:	20.04
Codename:	focal

# uname -a
Linux my-machine 5.15.0-69-generic #76~20.04.1-Ubuntu SMP Mon Mar 20 15:54:19 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux