Fixes DB schema validation

src/Umbraco.Core/Persistence/SqlSyntax/ISqlSyntaxProvider.cs

@@ -53,6 +53,8 @@ namespace Umbraco.Core.Persistence.SqlSyntax
         string TruncateTable { get; }
         string CreateConstraint { get; }
         string DeleteConstraint { get; }
+
+        [Obsolete("This is never used, use the Format(ForeignKeyDefinition) instead")]
         string CreateForeignKeyConstraint { get; }
         string DeleteDefaultConstraint { get; }
         string FormatDateTime(DateTime date, bool includeTime = true);