Update flit-core requirement from <4,>=2 to >=3.12.0,<4

[dependabot]

Updates the requirements on flit-core to permit the latest version.

Changelog

Sourced from flit-core's changelog.

Release history

Version 4.0

This version contains breaking changes, but most projects which are already using the [project] table for metadata shouldn't be affected, and can simply change the flit_core <4 constraint to <5.

• The [tool.flit.metadata] table is no longer used for project metadata (:ghpull:771). Use the newer :ref:[project] table <pyproject_toml_project> instead (or if that is not possible, build with flit_core <4).
• :ref:build_cmd and :ref:publish_cmd no longer include files in the sdist based on what is committed in git or Mercurial (:ghpull:772). These commands now build packages more like Flit does when called as a backend by e.g. python -m build. Specify :ref:sdist include & exclude patterns <pyproject_toml_sdist> instead (Flit can help to generate these), or pass the --use-vcs option to get the old behaviour back.
• flit_core now requires Python 3.8 or above (:ghpull:738)
• The --setup-py option to generate sdists containing a setup.py file is no longer available (:ghpull:776).
• Making typing stubs packages with a -stubs suffix will now work (:ghpull:742).
• The default glob patterns for license files have been extended to include NOTICE* and AUTHORS* (:ghpull:758).
• license-files glob patterns can contain spaces (:ghpull:797).
• Fix a bug where license files could be found twice on Windows (:ghpull:752).
• The new Import-Name and Import-Namespace metadata fields (metadata 2.5) are now supported (:ghpull:774). In most cases no new input is required, as Flit will create this metadata automatically.
• Fix creating RECORD files when file names include commas (:ghpull:744).
• The --use-vcs option now correctly recognises git from inside a git worktree folder (:ghpull:799).
• On Python 3.12 and above, flit build now uses the 'data' filter when extracting the just-created sdist prior to building a wheel (:ghpull:775). This restricts some special features of tar files, but sdists are unlikely to use these features, and they would probably break in other scenarios if you did.
• The vendorised readme_renderer package was updated to version 44.0 (:ghpull:760).

Version 3.12

• Support for license expressions using the AND and OR operators (:ghpull:731).
• Recognise __version__: str = "0.1" annotated assignments when finding the version number (:ghpull:728).
• Clear error message when referring to a license file in a parent directory,

... (truncated)

Commits

• 1c81417 Merge pull request #737 from pypa/changelog-3.12
• d9ce4c6 Bump version: 3.11.0 → 3.12.0
• 27ea098 Prepare release notes for 3.12
• 7a6e9b2 Merge pull request #731 from AA-Turner/compound-spdx
• 0b07d23 Reword error messages
• 38429c9 Add empty expression test case
• 4ab2335 Add brackets-only test case
• 78db7b5 Shorten error messages
• 20e1729 Handle mixed-case licence operators
• 9bd1477 Raise error on expressions with no operator
• Additional commits viewable in compare view

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