ci: downgrade windows runner to llvm20

Author: Hugobros3

.github/workflows/cmake-multi-platform.yml

@@ -68,8 +68,8 @@ jobs:
     #    mkdir SPIRV-Headers/install
     #    cmake --install SPIRV-Headers/build --prefix SPIRV-Headers/install
 
-    - name: Install Clang & LLVM (setup-clang)
-      uses: egor-tensin/[email protected]
+    #- name: Install Clang & LLVM (setup-clang)
+    #  uses: egor-tensin/[email protected]
 
     #- name: Install LLVM (winlibs)
     #  if: startsWith(matrix.os,'windows')