Restrict MSVC compiler to 2022

by using windows-2022 (which stands for Windows Server 2022) instead of
windows-latest.
Otherwise there is a compile error regarding usage of stdext in Qt5;
stdext was removed in MSVC 2026.

Author: usiems

.github/workflows/build.yml

@@ -340,7 +340,7 @@ jobs:
 #           qt-version: '5.9.*'
 #           pythonqtall-config: 'PythonQtCore PythonQtGui PythonQtMultimedia'
 
-    runs-on: windows-latest
+    runs-on: windows-2022
     steps:
 
     - name: Checkout PythonQt

.github/workflows/build_latest.yml

@@ -22,7 +22,7 @@ jobs:
         os: ['ubuntu', 'windows']
         qt-version: [ '5.12.*', '5.15.*', '6.11.*' ]
         python-version: [ '3.12' ]
-    runs-on: ${{ matrix.os }}-latest
+    runs-on: ${{ matrix.os == 'windows' && 'windows-2022' || 'ubuntu-latest' }}
     steps:
 
     - name: Install MSVC