Migrate packages to flit-core 4+

[hroncok]

We are planning to handle migration from python-flit-core 3 to 4 via a compat package.

• https://src.fedoraproject.org/rpms/python-flit-core/pull-request/21
• https://src.fedoraproject.org/rpms/python-flit-core/pull-request/22

Based on a dirty analysis, the following packages will appear at https://tiny.distro.builders/view-rpm--view-eln--python3-flit-core3.html when we do.

• pyparsing https://src.fedoraproject.org/rpms/pyparsing/pull-request/25
• python-docutils 🐍 https://src.fedoraproject.org/rpms/python-docutils/pull-request/25
• python-installer 🐍 https://src.fedoraproject.org/rpms/python-installer/pull-request/6
• python-jinja2 🐍 https://src.fedoraproject.org/rpms/python-jinja2/pull-request/33
• python-pip 🐍 https://src.fedoraproject.org/rpms/python-pip/pull-request/174
• python-ptyprocess https://src.fedoraproject.org/rpms/python-ptyprocess/pull-request/4
• python-pypdf fixed in 6.16.x update
• python-pyproject-hooks 🐍 https://src.fedoraproject.org/rpms/python-pyproject-hooks/pull-request/8
• python-qrcode (⚠️ only uses flit-core in ELN) https://src.fedoraproject.org/rpms/python-qrcode/pull-request/10
• python-roman-numerals 🐍 https://src.fedoraproject.org/rpms/python-roman-numerals/pull-request/2
• python-testpath 🐍 https://src.fedoraproject.org/rpms/python-testpath/pull-request/12
• python-typing-extensions https://src.fedoraproject.org/rpms/python-typing-extensions/pull-request/29

content-resolver-input PR:

• Mark python-flit-core3 as unwanted content-resolver-input#1659

We don't want to branch 2 flit-core packages for c11s, so we'll need to migrate those. I'll start working on python-main packages first (indicated by the 🐍 emoji).

[yselkowitz]

Could you please add flit-core3 to python unwanted?

[hroncok]

That was my next step here; I forgot to mention it.

[hroncok]

All PRs open. python-typing-extensions has an unrelated FTBFS