revert build machine

Author: dnperfors

.github/workflows/ci.yml

@@ -68,7 +68,7 @@ jobs:
   testOnSupportedDotnetVersions:
     strategy:
       matrix:
-        os: [ubuntu-latest, windows-latest]
+        os: [ubuntu-22.04, windows-latest]
     runs-on: ${{ matrix.os }}
     steps:
     - name: Checkout
@@ -81,7 +81,7 @@ jobs:
         dotnet-version: |
           8.0.x
           9.0.x
-        include-prerelease: true
+        include-prerelease: false
     - name: Dump .NET info
       run: dotnet --info
     - name: Restore dependencies