vim-patch:9.0.0731: clang-tidy configuration files are not recognized (#20620)

Problem:    clang-tidy configuration files are not recognized.
Solution:   Recognize clang-tidy files as yaml. (closes vim/vim#11350)
af40f9af33

src/nvim/testdir/test_filetype.vim

@@ -641,7 +641,7 @@ let s:filename_checks = {
     \ 'xsd': ['file.xsd'],
     \ 'xslt': ['file.xsl', 'file.xslt'],
     \ 'yacc': ['file.yy', 'file.yxx', 'file.y++'],
-    \ 'yaml': ['file.yaml', 'file.yml'],
+    \ 'yaml': ['file.yaml', 'file.yml', '.clang-tidy'],
     \ 'yang': ['file.yang'],
     \ 'z8a': ['file.z8a'],
     \ 'zig': ['file.zig'],