@Override
            public List<ValidationEvent> unionShape(UnionShape shape) {
                return validateUnion(shape, model);
            }
Sets a list of additional regular expression patterns that indicate a
value carries a timestamp.

@param additionalPatterns Additional patterns to add.
smithy-linters/src/main/java/software/amazon/smithy/linters/ShouldHaveUsedTimestampValidator.java