www/ruby-rouge: update to 3.26.1

3.26.1: 2021-09-17

* CPP Lexer

  Add year and date chrono literals, add std::complex literals, fix chrono
  literals with digit separator (#1665 by swheaton)

* Factor and GHC Core Lexer

  Fix catastrophic backtrack (#1690 by Ravlen)

* JSL Lexer

  Fix single line block comments, scoped variables and functions (#1663 by
  BenPH)

* YAML Lexer

  Fix YAML key containing special character (#1667 by tancnle)

* Fix Ruby 2.7 keyword parameter deprecation warning (#1597 by stanhu)
* Updated README (#1666 by dchacke)

(taca)