Update LLVM.

Author: jdm

.github/workflows/rust.yml

@@ -35,7 +35,7 @@ jobs:
         .\MozillaBuildSetup.exe /S | Out-Null
         iwr -useb get.scoop.sh -outfile 'install.ps1'
         .\install.ps1 -RunAsAdmin
-        scoop install llvm@13.0.1 --global
+        scoop install llvm@14.0.6 --global
         echo "C:\ProgramData\scoop\shims;C:\Users\runneradmin\scoop\shims" | Out-File -FilePath $env:GITHUB_PATH -Encoding utf8 -Append
     # TODO: Remove this step when the compatibility issue between mozjs and
     #       Homebrew's Python 3.10 formula (servo/rust-mozjs#559) is truly fixed