pyproject.toml optional-dependencies are not considered dependency-type: "development"

[seamuslowry]

Is there an existing issue for this?

• I have searched the existing issues

Package ecosystem

pip

Package manager version

No response

Language version

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Manifest location and content before the Dependabot update

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dependabot.yml content

version: 2
updates:
  - package-ecosystem: "pip"
    directory: "/"
    schedule:
      interval: "weekly"
    groups:
      dev-dependencies:
        dependency-type: "development"

Updated dependency

No response

What you expected to see, versus what you actually saw

I'd expect to see the two optional dependencies pyright and pylint to be updated as a group in a single PR. However, they are instead updated separately and the dependabot action logs

Please check your configuration as there are groups where no dependencies match:
- dev-dependencies

Separately, it's not really clear what should/shouldn't be considered a development dependency type for the pip package manager.

Native package manager behavior

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Images of the diff or a link to the PR, issue, or logs

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Smallest manifest that reproduces the issue

[build-system]
requires = ["setuptools >= 74.0"]
build-backend = "setuptools.build_meta"

[project]
name = "example"
version = "0.0.1"
description = "example"
requires-python = ">=3.9"
dependencies = []

[project.optional-dependencies]
lint = [
"pyright==1.1.379",
]
test = [
"pytest==8.3.2",
]