update included editorconfig-core-py to support python3.11

[SimonHeimberg]

I got the error re.error: global flags not at the start of the expression at position 15

This is fixed by editorconfig/editorconfig-core-py@6722ab5, which is included in v0.12.3

I fixed this locally by copying the changed lines linked above.

Global flags at the start of the expression were deprecated since python 3.6 and got invalid in python 3.11 (from Python-Markdown/markdown#1312).

[SimonHeimberg]

I am also fine to have it as (up to date) submodule, as suggested in #17
And to tag a new version #26 is still a good idea.

[xuhdev]

Updated, please give it a try.

[SimonHeimberg]

Updated, please give it a try.

It works 🍾 🎉 Thanks
And thank you for the hint in README.md. I never heard about subtree.