vim-patch:9.0.0602: new TypeScript extensions are not recognized

Problem:    New TypeScript extensions are not recognized.
Solution:   Recognize .mts and .cts files. (closes vim/vim#11237)
7fc6c0e4da

src/nvim/testdir/test_filetype.vim

@@ -583,6 +583,7 @@ let s:filename_checks = {
     \ 'tssop': ['file.tssop'],
     \ 'tsv': ['file.tsv'],
     \ 'twig': ['file.twig'],
+    \ 'typescript': ['file.mts', 'file.cts'],
     \ 'typescript.glimmer': ['file.gts'],
     \ 'typescriptreact': ['file.tsx'],
     \ 'uc': ['file.uc'],