New CI: Microsoft Visual Studio 2022.

Signed-off-by: Vladislav Shchapov <vladislav@shchapov.ru>

.github/workflows/windows.yml

@@ -10,9 +10,10 @@ jobs:
     runs-on: ${{matrix.os}}
     strategy:
       matrix:
-        # windows-2019 has MSVC 2019 installed:
+        # windows-2019 has MSVC 2019 installed;
+        # windows-2022 has MSVC 2022 installed:
         # https://github.com/actions/virtual-environments.
-        os: [windows-2019]
+        os: [windows-2019, windows-2022]
         platform: [Win32, x64]
         build_type: [Debug, Release]
         standard: [11, 17, 20]
@@ -28,6 +29,8 @@ jobs:
           - os: windows-2019
             standard: 20
             platform: Win32
+          - os: windows-2022
+            standard: 11
 
     steps:
     - uses: actions/checkout@v2