ci: install newer clang in cross-platform compilation test workflow

Author: DorianNiemiecSVRJS

.github/workflows/crossplatform.yml

@@ -128,7 +128,7 @@ jobs:
         if: matrix.cross-build == true
         uses: eclipse-score/apt-install@main
         with:
-          packages: debootstrap clang lld libclang-dev wrk nghttp2-client openssl python3 llvm qemu-user-static cmake
+          packages: debootstrap clang-20 lld-20 libclang-20-dev wrk nghttp2-client openssl python3 llvm qemu-user-static cmake
 
       - name: Install Cross
         if: matrix.cross-rs == true