patch 9.1.0971: filetype: SLNX files are not recognized

Problem:  filetype: SLNX files are not recognized
Solution: detect '*.slnx' files as xml filetype
          (Gustav Eikaas)

References:
https://blog.ndepend.com/slnx-the-new-net-solution-xml-file-format/
https://blog.jetbrains.com/dotnet/2024/10/04/support-for-slnx-solution-files/

closes: #16334

Signed-off-by: GustavEikaas <gustav.eikaas@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/version.c b/src/version.c
index 8e884af..b1ce2cc 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    971,
+/**/
     970,
 /**/
     969,