ci: only 8.x

Author: chemodun

.github/workflows/build-executables.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: windows-latest
     strategy:
       matrix:
-        dotnet-version: [ '6.x', '8.x' ]
+        dotnet-version: [ '8.x' ]
     steps:
       # Step 1: Checkout the repository
       - name: Checkout repository