Improve system.versionstr + doc + reset CI to windows-latest

.github/workflows/tests.yml

@@ -6,7 +6,7 @@ on: [push, workflow_dispatch]
 
 jobs:
   generate_ctypes:
-    runs-on: windows-2025
+    runs-on: windows-latest
     timeout-minutes: 5
 
     steps:
@@ -21,7 +21,7 @@ jobs:
   tests:
     # Not a real dependency : but starting tests when ctypes generation is broken is not useful
     needs: generate_ctypes
-    runs-on: windows-2025
+    runs-on: windows-latest
     timeout-minutes: 15
     strategy:
       fail-fast: false