[gnome-builder/wip/gtk4-port] .gitlab-ci.yml: install llvm14 dependency

[Christian Hergert <chergert src gnome org>]

commit b5a6d50ef2d2ed38c11d66075730cab46198c5d7
Author: Christian Hergert <chergert redhat com>
Date:   Tue Jun 14 13:42:59 2022 -0700

    .gitlab-ci.yml: install llvm14 dependency

 .gitlab-ci.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index fa9fd3c13..8dbea4210 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -15,7 +15,7 @@ flatpak:
     BUNDLE: "gnome-builder-git.flatpak"
   before_script:
     - flatpak --user remote-add --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo
-    - flatpak --user install -y flathub org.freedesktop.Sdk.Extension.llvm12//21.08
+    - flatpak --user install -y flathub org.freedesktop.Sdk.Extension.llvm14//21.08
     - flatpak --user install -y flathub org.freedesktop.Sdk.Extension.node14//21.08
 
 nightly: