graphviz: upgrade 13.1.0 -> 13.1.1

Changelog:
=============
- When built with PangoCairo, the Kitty plugin is now available in Graphviz
  static builds. Previously it was only available in shared library (on-demand
  plugin loading) builds.
- The distributed Fedora and Rocky Linux packages now include the Kitty plugin.
- On Windows, the GDI+ plugin is now available in Graphviz static builds.
  Previously it was only available in shared library (on-demand plugin loading)
  builds.
- Processing a graph with GVPR no longer makes explicit the default '"\N"' label
  for nodes. This undoes a change from Graphviz 13.0.1.
- 'nop' no longer preserves empty string labels. This undoes a change from
  Graphviz 13.0.1.
- The order of programmatic calls to 'gvContext'/'gvContextPlugin' and
  'agmemread' once again affects default node labels. This undoes a change from
  Graphviz 13.0.1.
- Spline routing can now deal with horizontal and vertical lines. This removes
  some instances of the "Something is probably seriously wrong" warning.
- Using 'layerselect' beyond layer 1 no longer causes crashes.
- Correct parsing of a PDF file's '/MediaBox' section no longer depends on the
  internal 'BUFSIZ' constant.
- Round tripping a graph through a file no longer causes it to acquire a default
  node label '\N'.

Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

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