Log Message:
devel/ruby-regexp_parser: update to 1.7.1

Update ruby-regexp_parser to 1.7.1

### [1.7.1] - 2020-06-07 - [Ammar Ali](mailto:ammarabuali@gmail.com)

### Fixed

- Support for literals that include the unescaped delimiters `{`, `}`, and `]`. These
  delimiters are informally supported by various regexp engines.