CI-windows.yml: removed Qt 6.3 from build matrix (#4829)

Author: firewave

.github/workflows/CI-windows.yml

@@ -19,7 +19,7 @@ jobs:
     strategy:
       matrix:
         os: [windows-2019, windows-2022]
-        qt_ver: [5.15.2, 6.2.4, 6.3.2, 6.4.2]
+        qt_ver: [5.15.2, 6.2.4, 6.4.2]
       fail-fast: false
 
     runs-on: ${{ matrix.os }}