Problem:    FIRRTL files are not recognized.
Solution:   Add a pattern for FIRRTL files. (Amaan Qureshi, closes vim/vim#11931)

https://github.com/vim/vim/commit/685bf83b73d0fe6fd36bb2949bebd6aae66a139e

Co-authored-by: Amaan Qureshi <amaanq12@gmail.com>

Problem:    .clangd and .stylelintrc files don't get a filetype.
Solution:   Use yaml for .clangd and json for .stylelintrc files. (Mark
            Skelton, closes vim/vim#11916)

https://github.com/vim/vim/commit/9c51798a1f3b79ace5ae0551a8bb122025ac94ed

Co-authored-by: Mark Skelton <mdskelton99@gmail.com>

refactor(tests): run unittests using main nvim binary - delete separate nvim-test build

fix(treesitter): validate language name

Problem:    KDL files are not recognized.
Solution:   Add a pattern for KDL files. (Amaan Qureshi, closes vim/vim#11898)

https://github.com/vim/vim/commit/907349a74331fc1bc48cf43c1e7d54cb9e0e4fc9

Co-authored-by: Amaan Qureshi <amaanq12@gmail.com>

Problem: Elsa files are not recognized.
Solution: Add the name of Elsa files. (Amaan Qureshi)

https://github.com/vim/vim/commit/2a99fe6c41efcd5d1eb47823e7e73cf391e230ba

Problem:    NetworkManager connection files are not recognized.
Solution:   Add a pattern for NetworkManager connection files. (closes vim/vim#11893)

https://github.com/vim/vim/commit/04e4f1d98556e67d7337224b67b71c828410ee0f

Co-authored-by: ObserverOfTime <chronobserver@disroot.org>

Problem: Some injections (like markdown) allow specifying arbitrary
language names for code blocks, which may be lead to errors when
looking for a corresponding parser in runtime path.

Solution: Validate that the language name only contains alphanumeric
characters and `_` (e.g., for `c_sharp`) and error otherwise.