remove CI check for Windows-2019

The Windows 2019 image will be retired by Github by end of June.

Author: lonvia

.github/workflows/ci.yml

@@ -341,7 +341,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [windows-2019, windows-2022, windows-2025]
+        os: [windows-2022, windows-2025]
     runs-on: ${{ matrix.os }}
 
     env: