Update CI to install LLVM 16 first

Author: AmrDeveloper

.github/workflows/ci.yaml

@@ -24,6 +24,9 @@ jobs:
     name: Clippy
     runs-on: ubuntu-latest
     steps:
+      - run: wget https://apt.llvm.org/llvm.sh
+      - run: chmod +x llvm.sh
+      - run: sudo ./llvm.sh 16
       - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@stable
       - run: cargo clippy -- -D warnings