Change platform toolset on Windows

Author: savannahostrowski

.github/workflows/tail-call.yml

@@ -46,7 +46,7 @@ jobs:
       - name: Build
         shell: pwsh
         run: |
-          $env:PlatformToolset = "v145"
+          $env:PlatformToolset = "clangcl"
           ./PCbuild/build.bat --tail-call-interp ${{ matrix.build_flags }} -c Release -p ${{ matrix.architecture }}
       - name: Test
         if: matrix.run_tests