vim-patch:9.0.0417: Jsonnet files are not recognized (#20119)

Problem:    Jsonnet files are not recognized.
Solution:   Add a pattern for Jsonnet files. (Cezary Drożak, closes vim/vim#11073,
            closes vim/vim#11081)
2a4c885d54

src/nvim/testdir/test_filetype.vim

@@ -285,6 +285,7 @@ let s:filename_checks = {
     \ 'json': ['file.json', 'file.jsonp', 'file.json-patch', 'file.webmanifest', 'Pipfile.lock', 'file.ipynb', '.babelrc', '.eslintrc', '.prettierrc', '.firebaserc', 'file.slnf'],
     \ 'json5': ['file.json5'],
     \ 'jsonc': ['file.jsonc'],
+    \ 'jsonnet': ['file.jsonnet', 'file.libjsonnet'],
     \ 'jsp': ['file.jsp'],
     \ 'julia': ['file.jl'],
     \ 'kconfig': ['Kconfig', 'Kconfig.debug', 'Kconfig.file'],