moved AlterStringColumn to IDatabase interface so that it can be overridden in the Sqlite provider rather than requiring conditional logic in the migrations

Oqtane.Server/Databases/Interfaces/IDatabase.cs

@@ -34,6 +34,8 @@ namespace Oqtane.Databases.Interfaces
 
         public void DropColumn(MigrationBuilder builder, string name, string table);
 
+        public void AlterStringColumn(MigrationBuilder builder, string name, string table, int length, bool nullable, bool unicode);
+
         public DbContextOptionsBuilder UseDatabase(DbContextOptionsBuilder optionsBuilder, string connectionString);
     }
 }