Migrate remaining mentions of windows-2022 to windows-2025

Follow-up to #803

Author: Arlodotexe

.github/workflows/build.yml

@@ -65,7 +65,7 @@ jobs:
   # Build both Uno.UI/WinUI2/UWP and Uno.WinUI/WinUI3/WindowsAppSDK versions of our packages using a matrix
   build:
     needs: [Xaml-Style-Check]
-    runs-on: windows-2022
+    runs-on: windows-2025
 
     # See https://docs.github.com/actions/using-jobs/using-a-matrix-for-your-jobs
     strategy:
@@ -249,7 +249,7 @@ jobs:
           dotnet-dump analyze ${{ steps.filter.outputs.dump_files }} -c "clrstack" -c "pe -lines" -c "exit"
 
   package:
-    runs-on: windows-2022
+    runs-on: windows-2025
     needs: [build]
     strategy:
       fail-fast: false # prevent one matrix pipeline from being cancelled if one fails, we want them all to run to completion.
@@ -380,7 +380,7 @@ jobs:
   sign:
     needs: [package]
     if: ${{ startsWith(github.ref, 'refs/heads/rel/') || startsWith(github.ref, 'refs/tags/') }}
-    runs-on: windows-2022
+    runs-on: windows-2025
     permissions:
       id-token: write # Required for requesting the JWT