Update Windows runner version in GitHub Actions CI workflow

Author: ahosier

.github/workflows/build.yml

@@ -14,7 +14,7 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - runner: windows-latest
+          - runner: windows-2022
             os-name: Windows
             qt-arch: win64_msvc2019_64
           - runner: ubuntu-24.04