Switch windows-2019 GHA images to windows-2022.

windows-2019 is being deprecated and will be removed. This means msvc-14.0
and msvc-14.2 toolsets are no longer available.

.github/workflows/ci.yml

@@ -891,16 +891,6 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - toolset: msvc-14.0
-            cxxstd64: "14"
-            cxxstd32: "14"
-            cxxflags: "/arch:AVX"
-            os: windows-2019
-          - toolset: msvc-14.2
-            cxxstd64: "14,17,20,latest"
-            cxxstd32: "14"
-            cxxflags: "/arch:AVX"
-            os: windows-2019
           - toolset: msvc-14.3
             cxxstd64: "14,17,20,latest"
             cxxstd32: "14"
@@ -912,8 +902,8 @@ jobs:
             cxxflags: "-mavx -mcx16"
             os: windows-2022
           - toolset: gcc
-            cxxstd64: "11-gnu,14-gnu,17-gnu,2a-gnu"
-            os: windows-2019
+            cxxstd64: "11-gnu,14-gnu,17-gnu,20-gnu,23-gnu"
+            os: windows-2022
 
           - name: CMake MSVC tests
             cmake_tests: 1