Attempt to fix Windows CI

Author: zanieb

.github/workflows/windows.yml

@@ -94,6 +94,8 @@ jobs:
       - name: Build
         shell: cmd
         run: |
+          # Workaround for https://github.com/actions/runner-images/issues/10819
+          $env:VCToolsRedistDir = -join ($env:VCINSTALLDIR, "Redist\MSVC\", $env:VCToolsVersion, "\")
           call "C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\VC\Auxiliary\Build\${{ matrix.vcvars }}"
           py.exe -3.9 build-windows.py --python ${{ matrix.py }} --sh c:\cygwin\bin\sh.exe --options ${{ matrix.options }}