py-pygments: updated to 2.12.0

Version 2.12.0
--------------
- Added lexers:
  * Cplint
  * Macaulay2
  * Minecraft
  * Qlik
  * ``UnixConfigLexer`` for "colon-separated" config files, like ``/etc/passwd``

- Updated lexers:
  * Agda: Update keyword list
  * C family: Fix identifiers after ``case`` statements
  * Clojure: Highlight ratios
  * Csound: Update to 6.17
  * CSS: Update the list of properties
  * Elpi:
    - Fix catastrophic backtracking
    - Fix handling of ``->``

  * Futhark: Add missing tokens
  * Gherkin: Add ``But``
  * Inform6: Update to 6.36
  * JSON: Support C comments in JSON
  * LilyPond:
    - Fix incorrect lexing of names containing a built-in
    - Fix properties containing dashes

  * PHP: Update builtin function and keyword list
  * Scheme: Various improvements
  * Spice: Update the keyword list, add new types
  * Terraform:
    - Support non-idiomatic comments
    - Fix class name lexing

- Add ``plugins`` argument to ``get_all_lexers()``.
- Bump minimal Python version to 3.6
- Fix multiple lexers marking whitespace as ``Text``
- Remove various redundant uses of ``re.UNICODE``
- Associate ``.resource`` with the Robot framework
- Associate ``.cljc`` with Clojure
- Associate ``.tpp`` with C++
- Remove traces of Python 2 from the documentation
- The ``native`` style was updated to meet the WCAG AAA contrast guidelines
- Fix various typos
- Fix ``Groff`` formatter not inheriting token styles correctly
- Various improvements to the CI
- The Ada lexer has been moved to a separate file
- When ``linenos=table`` is used, the ``<table>`` itself is now wrapped with a ``<div class="highlight">`` tag instead of placing it inside the ``<td class="code">`` cell

(adam)