Upgrade CI to use windows-2022.

Fixes deprecation of windows-2019 runner images.

Author: dmsc

.github/workflows/c-cpp.yml

@@ -60,7 +60,7 @@ jobs:
 
   build-windows:
     name: Build and run tests on Windows
-    runs-on: windows-2019
+    runs-on: windows-2022
     permissions:
       contents: read
       pull-requests: read