Log Message:
ruby-cairo: update to 1.17.12.

Upstream changes (from NEWS):

Release 1.17.12 (2023-06-17) Sutou Kouhei <kou@cozmixng.org>
============================================================

Improvements
------------

  * Added support for Gentoo Linux.

Fixes
-----

  * Fixed ALT Linux dependencies.

Release 1.17.11 (2023-06-16) Sutou Kouhei <kou@cozmixng.org>
============================================================

Improvements
------------

  * Added support for ALT Linux.

Fixes
-----

  * Fixed conda dependencies.

Release 1.17.10 (2023-06-16) Sutou Kouhei <kou@cozmixng.org>
============================================================

Improvements
------------

  * Added missing dependency packages for conda.

Release 1.17.9 (2023-06-14) Sutou Kouhei <kou@cozmixng.org>
===========================================================

Improvements
------------

  * Dropped support for fat gem.
    [GH-78][https://github.com/rcairo/rcairo/issues/78]
    [Reported by Largo]

  * Added support for auto native package installation with conda.

  * Added support for cairo 1.17.8:

    * Added Cairo::SVGFontError.

    * Added Cairo::ColorMode.

    * Added Cairo::FontOptions#color_mode.

    * Added Cairo::FontOptions#color_mode=.

    * Added Cairo::ColorPalette.

    * Added Cairo::FontOptions#color_palette.

    * Added Cairo::FontOptions#color_palette=.

    * Added Cairo::FontOptions#set_custom_palette_color.

Fixes
-----

  * Fixed the number of arguments of Cairo::GLSurface#initialize and
    Cairo::GLTextureSurface#initialize.
    [GH-79][https://github.com/rcairo/rcairo/issues/79]
    [Patch by Dimitry Andric]

Thanks
------

  * Largo

  * Dimitry Andric