Update dotnet.yml

Author: RogerKratz

.github/workflows/dotnet.yml

@@ -19,7 +19,7 @@ jobs:
           - DB: Oracle
             CONNECTION_STRING: "User ID=nhibernate;Password=nhibernate;Metadata Pooling=false;Self Tuning=false;Data Source=(DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521)) (CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME = XEPDB1)))"
           - DB: SQLite
-    runs-on: windows-latest
+    runs-on: ubuntu-latest
     continue-on-error: ${{matrix.ALLOW_FAILURE == true}}
     env:
       LANG: en-US.UTF-8 #default POSIX locale doesn't support ignore case comparisons