Flit core can be used at least to build tomli.

tomli installs and basic tomli.loads and tomli.load works. Tested the first example from https://github.com/toml-lang/toml#readme

https://src.fedoraproject.org/rpms/python-mistune08/pull-request/1

https://pagure.io/fesco/issue/2859#comment-816605 was resolved, this change was approved for Fedora 37. Note that nothing was tested during the approval.

Before:

$ rpmlint -c rpmlint.toml python3.11-3.11.0~rc2-1.fc38.src.rpm
============================ rpmlint session starts ============================
rpmlint: 2.2.0
configuration:
    /usr/lib/python3.10/site-packages/rpmlint/configdefaults.toml
    /etc/xdg/rpmlint/fedora.toml
    /etc/xdg/rpmlint/licenses.toml
    /etc/xdg/rpmlint/scoring.toml
    /etc/xdg/rpmlint/users-groups.toml
    /etc/xdg/rpmlint/warn-on-functions.toml
    rpmlint.toml
checks: 32, packages: 1

python3.11.src: W: invalid-license Python-2.0.1
 1 packages and 0 specfiles checked; 0 errors, 1 warnings, 0 badness; has taken 0.3 s 

With rpmlint-fedora-license-data-1.4-1.fc35.noarch:

$ rpmlint -c rpmlint.toml python3.11-3.11.0~rc2-1.fc38.src.rpm
============================ rpmlint session starts ============================
rpmlint: 2.2.0
configuration:
    /usr/lib/python3.10/site-packages/rpmlint/configdefaults.toml
    /etc/xdg/rpmlint/fedora-legacy-licenses.toml
    /etc/xdg/rpmlint/fedora-spdx-licenses.toml
    /etc/xdg/rpmlint/fedora.toml
    /etc/xdg/rpmlint/licenses.toml
    /etc/xdg/rpmlint/scoring.toml
    /etc/xdg/rpmlint/users-groups.toml
    /etc/xdg/rpmlint/warn-on-functions.toml
    rpmlint.toml
checks: 32, packages: 1

 1 packages and 0 specfiles checked; 0 errors, 0 warnings, 0 badness; has taken 0.2 s 

centpkg users also need FEDORA-2022-113a390dd5

Don't push this update to Fedora 37 until https://pagure.io/fesco/issue/2859#comment-816605 is resolved.

Tested basic functionality (clicking here and there) in Fedora-Python-Classroom-Live-x86_64-37_Beta-1.5.iso.

I am not sure that helps. A change in fedpkg won't make it impossible to update rpkg only. I am not sure how severe is this is, probably not much :/