patch 9.1.0237: filetype: mplstyle files are not recognized

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

closes: #14358

Signed-off-by: Wu, Zhenyu <wuzhenyu@ustc.edu>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/testdir/test_filetype.vim b/src/testdir/test_filetype.vim
index df38038..b1af702 100644
--- a/src/testdir/test_filetype.vim
+++ b/src/testdir/test_filetype.vim
@@ -820,7 +820,7 @@
     xsd: ['file.xsd'],
     xslt: ['file.xsl', 'file.xslt'],
     yacc: ['file.yy', 'file.yxx', 'file.y++'],
-    yaml: ['file.yaml', 'file.yml', 'file.eyaml', '.clangd', '.clang-format', '.clang-tidy'],
+    yaml: ['file.yaml', 'file.yml', 'file.eyaml', '.clangd', '.clang-format', '.clang-tidy', 'file.mplstyle'],
     yang: ['file.yang'],
     yuck: ['file.yuck'],
     z8a: ['file.z8a'],
diff --git a/src/version.c b/src/version.c
index ccc4e83..2bf701c 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    237,
+/**/
     236,
 /**/
     235,