Add a test-dependency on types-toml for mypy
toml is a dependency of pytest<7 but it does not come with the types-toml package, which is needed for mypy to run ok on python >= 3.9.
Migrated from D7247 (view on Phabricator)
Staging instance, all changes can be removed at any time
toml is a dependency of pytest<7 but it does not come with the types-toml package, which is needed for mypy to run ok on python >= 3.9.
Migrated from D7247 (view on Phabricator)