Pin Windows CI to windows-2022 runner

windows-latest was repointed to a VS2026 toolset whose newer MSVC promotes a
GSL [[gsl::suppress]] deprecation (C4875) to an error under /WX, breaking the
Win32 and UWP builds. Pin those jobs to windows-2022 so the established VS2022
toolset is used, restoring green CI without a dependency or source change.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: Branimir Karadžić

.github/workflows/build-uwp.yml

@@ -12,7 +12,7 @@ on:
 
 jobs:
   build:
-    runs-on: windows-latest
+    runs-on: windows-2022
     timeout-minutes: 15
     steps:
       - uses: actions/checkout@v5

.github/workflows/build-win32.yml

@@ -12,7 +12,7 @@ on:
 
 jobs:
   build:
-    runs-on: windows-latest
+    runs-on: windows-2022
     timeout-minutes: 15
     steps:
       - uses: actions/checkout@v5