The project language file for this project is Markdown, as this project (Maintainers-info) is just documentation and needs nothing more.
This is the second time I am using Markdown as a project language file, as I learned how to make the GitHub linguist recognize Markdown as a language a couple weeks ago. I found this out when snooping around on Apple/Swift Evolution if you want to do this yourself, simply add this to your .gitattributes file (if you haven't created one yet, make it now, do not add anything else to the file name but .gitattributes)
*.md linguist-detectable=true
*.md linguist-documentation=falseFile type: Markdown document (*.md)
File version: 1 (Monday, June 21st 2021 at 9:52 pm)
Line count (including blank lines and compiler line): 26