ci: luals_version 3.13.9 -> 3.15.0 (#3167)

Author: alex-courtis

.github/workflows/ci.yml

@@ -49,7 +49,7 @@ jobs:
     strategy:
       matrix:
         nvim_version: [ stable, nightly ]
-        luals_version: [ 3.13.9 ]
+        luals_version: [ 3.15.0 ]
 
     env:
       VIMRUNTIME: /home/runner/nvim-${{ matrix.nvim_version }}/share/nvim/runtime