install LLVm 16 before running dotnet-fuzzing-tools.ps1 (#3462)

Author: chkeita

.github/workflows/ci.yml

@@ -375,6 +375,10 @@ jobs:
         with:
           # use global.json to install the correct version
           global-json-file: global.json
+      - name: install llVM
+        run: |
+          choco install llvm --version 16.0.6
+        shell: powershell
       - run: src/ci/dotnet-fuzzing-tools.ps1
         shell: pwsh
       - uses: actions/upload-artifact@v3