message: explicitly use windows-2019 to unblock ci
diff: @@ -35,7 +35,7 @@ jobs:
  build-windows:
  name: Build Windows 2019
  - runs-on: windows-latest
  + runs-on: windows-2019
  steps:
  - uses: actions/checkout@v2
  - name: Add msbuild to PATH
  @@ -54,7 +54,7 @@ jobs:
  build-windows-2017:
  name: Build Windows 2017
  - runs-on: windows-latest
  + runs-on: windows-2019
  steps:
  - uses: actions/checkout@v2
  - name: Add msbuild to PATH
  @@ -68,7 +68,7 @@ jobs:
  build-windows-2015:
  name: Build Windows 2015
  - runs-on: windows-latest
  + runs-on: windows-2019
  steps:
  - uses: actions/checkout@v2
  - name: Add msbuild to PATH
  @@ -82,7 +82,7 @@ jobs:
  build-dotnet-windows:
  name: Build .NET Windows
  - runs-on: windows-latest
  + runs-on: windows-2019
  strategy:
  matrix:
  configuration: [
  