patch 9.1.0248: filetype: yarn lock files are not recognized

Problem:  filetype: yarn lock files are not recognized
Solution: Detect 'yarn.lock' files as yaml
          (Wu, Zhenyu)

closes: #14369

Signed-off-by: Wu, Zhenyu <wuzhenyu@ustc.edu>
Signed-off-by: Christian Brabandt <cb@256bit.org>

runtime/filetype.vim

@@ -2959,6 +2959,9 @@ au filetypedetect BufNewFile,BufRead,StdinReadPost *
 	\   setf FALLBACK conf |
 	\ endif
 
+" Yarn lock
+au BufNewFile,BufRead yarn.lock			setf yaml
+
 
 " If the GUI is already running, may still need to install the Syntax menu.
 " Don't do it when the 'M' flag is included in 'guioptions'.

src/testdir/test_filetype.vim

@@ -820,7 +820,7 @@ def s:GetFilenameChecks(): dict<list<string>>
     xsd: ['file.xsd'],
     xslt: ['file.xsl', 'file.xslt'],
     yacc: ['file.yy', 'file.yxx', 'file.y++'],
-    yaml: ['file.yaml', 'file.yml', 'file.eyaml', 'any/.bundle/config', '.clangd', '.clang-format', '.clang-tidy', 'file.mplstyle'],
+    yaml: ['file.yaml', 'file.yml', 'file.eyaml', 'any/.bundle/config', '.clangd', '.clang-format', '.clang-tidy', 'file.mplstyle', 'yarn.lock'],
     yang: ['file.yang'],
     yuck: ['file.yuck'],
     z8a: ['file.z8a'],

src/version.c

@@ -704,6 +704,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    248,
 /**/
     247,
 /**/