[libxml2] gitlab-ci: Disable MSan for now

[Nick Wellnhofer <nwellnhof src gnome org>]

commit c63b2692c93f85c87a6ca93085f5ab89cbbd6b1c
Author: Nick Wellnhofer <wellnhofer aevum de>
Date:   Mon Sep 5 22:50:45 2022 +0200

    gitlab-ci: Disable MSan for now
    
    MSan seems broken on Ubuntu 22.04.

 .gitlab-ci.yml | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 09f705ef..7e805d3d 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -42,7 +42,8 @@ clang:asan:
     ASAN_OPTIONS: "detect_leaks=0"
     UBSAN_OPTIONS: "print_stacktrace=1"
 
-clang:msan:
+# Disabled, MSan seems broken on Ubntu 22.04
+.clang:msan:
   extends: .test
   only:
     - schedules