message: Use mfem/tpls for vcpkg Metis
  Patch the vcpkg portfile for Metis used in GitHub Actions on Windows
  to download the metis archive from mfem/tpls rather than the official
  Metis server.
diff: @@ -205,6 +205,10 @@ jobs:
  env:
  VCPKG_DEFAULT_BINARY_CACHE: ${{ github.workspace }}/vcpkg_cache
  run: |
  + $PortFile = 'C:\vcpkg\ports\metis\portfile.cmake'
  + $OriginalURL = 'http://glaros.dtc.umn.edu/gkhome/fetch/sw/metis/metis-${METIS_VERSION}.tar.gz'
  + $NewURL = 'https://github.com/mfem/tpls/raw/gh-pages/metis-5.1.0.tar.gz'
  + (Get-Content $PortFile).replace($OriginalURL, $NewURL) | Set-Content $PortFile
  vcpkg install metis --triplet=x64-windows-static
  # MFEM build and test
  