Update OSes in CI (#99)

Author: apolukhin

.github/workflows/ci.yml

@@ -135,14 +135,18 @@ jobs:
             cxxstd: "14,17,latest"
             addrmd: 32,64
             os: windows-2022
+          - toolset: msvc
+            cxxstd: "14,17,latest"
+            addrmd: 32,64
+            os: windows-2025
           - toolset: msvc-14.2
             cxxstd: "14,17,latest"
             addrmd: 32,64
-            os: windows-2019
+            os: windows-2022
           - toolset: gcc
             cxxstd: "11,14,17,2a"
             addrmd: 64
-            os: windows-2019
+            os: windows-2025
 
     runs-on: ${{matrix.os}}