patch 9.0.0602: new TypeScript extensions are not recognized

Problem:    New TypeScript extensions are not recognized.
Solution:   Recognize .mts and .cts files. (closes #11237)
diff --git a/src/testdir/test_filetype.vim b/src/testdir/test_filetype.vim
index ad77df3..1082eeb 100644
--- a/src/testdir/test_filetype.vim
+++ b/src/testdir/test_filetype.vim
@@ -584,6 +584,7 @@
     \ 'tssop': ['file.tssop'],
     \ 'tsv': ['file.tsv'],
     \ 'twig': ['file.twig'],
+    \ 'typescript': ['file.mts', 'file.cts'],
     \ 'typescript.glimmer': ['file.gts'],
     \ 'typescriptreact': ['file.tsx'],
     \ 'uc': ['file.uc'],
diff --git a/src/version.c b/src/version.c
index 0952526..4304751 100644
--- a/src/version.c
+++ b/src/version.c
@@ -700,6 +700,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    602,
+/**/
     601,
 /**/
     600,