patch 8.2.4251: vala files are not recognized

Problem:    Vala files are not recognized.
Solution:   Add the *.vala pattern. (closes #9654)
diff --git a/src/testdir/test_filetype.vim b/src/testdir/test_filetype.vim
index 34c9020..714d6f5 100644
--- a/src/testdir/test_filetype.vim
+++ b/src/testdir/test_filetype.vim
@@ -557,6 +557,7 @@
     \ 'usserverlog': ['usserver.log', 'USSERVER.LOG', 'usserver.file.log', 'USSERVER.FILE.LOG', 'file.usserver.log', 'FILE.USSERVER.LOG'],
     \ 'usw2kagtlog': ['usw2kagt.log', 'USW2KAGT.LOG', 'usw2kagt.file.log', 'USW2KAGT.FILE.LOG', 'file.usw2kagt.log', 'FILE.USW2KAGT.LOG'],
     \ 'vb': ['file.sba', 'file.vb', 'file.vbs', 'file.dsm', 'file.ctl'],
+    \ 'vala': ['file.vala'],
     \ 'vera': ['file.vr', 'file.vri', 'file.vrh'],
     \ 'verilog': ['file.v'],
     \ 'verilogams': ['file.va', 'file.vams'],
diff --git a/src/version.c b/src/version.c
index 0657a15..84300ba 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4251,
+/**/
     4250,
 /**/
     4249,