Update dependency graphviz/graphviz to v16

[ggrossetie]

This PR contains the following updates:

Package	Update	Change
graphviz/graphviz	major	14.1.3 → 16.0.0

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Release Notes

graphviz/graphviz (graphviz/graphviz)

v16.0.0

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Added

• A new agnnodes_z function is available as an alternative to agnnodes. This
  new function should be preferred in new code.

Changed

• The core plugin’s JSON renderer no longer overwrites the graph’s IO
  discipline. This will only be relevant to users writing their own plugin-using
  code.
• Breaking: The agmemconcat function has been removed.
• Breaking: Support for the undocumented postaction attribute has been
  removed.
• gvmap discards cluster attribute information if any cluster attribute
  has a negative value. This should never occur in normal operation (the
  cluster program only attaches non-negative cluster attributes), but only
  if a user has incorrectly edited dot source.
• Breaking: The gvmap options -g, -l, and -p have been removed.
  Their functionality was never implemented and passing these had no effect.
• Breaking: xdot_linear_grad.n_stops and xdot_radial_grad.n_stops are
  now of type unsigned.

Fixed

• Rendering multiple graphs with the core plugin’s FIG renderer no longer
  results in later outputs referring to colors defined in earlier outputs.
• libxdot rejects parsing of linear and radial gradients that claim a negative
  number of stops.
• Graphs that require “top sorting” during crossing minimization no longer cause
  Graphviz to crash. This was a regression in Graphviz 14.1.3. #​2851
• Fixed infinite loop in gvpr #​2849 by making object traversals skip newly
  created objects in mutable graphs. To do this, added API to get current object
  sequence numbers.

v15.1.1

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Changed

• When using dl_iterate_phdr to discover the plugin directory, the default
  compiled-in plugin directory is only overridden if dl_iterate_phdr
  successfully discovers the plugin directory. Previously if the
  dl_iterate_phdr search failed, the plugin directory would be considered the
  empty string.
• The cells of an HTML table are now emitted after the table border and rules.
  The main effect of this is, when post-styling a table with CSS, cell content
  remains visible. I.e. Z-ordering is more intuitive.

v15.1.0

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Added

• When using the fdp layout algorithm (dot -Kfdp … or fdp …), a new command
  line option -Lm… is supported for controlling the “m-limit”. See the man
  page for details about this option. #​954
• The vt plugin has a new option for using Unicode octant characters to render
  8-pixels-per-cell output, -Tvt-8up2.

Fixed

• When building from source from a Git checkout, builds with
  --disable-python/--disable-python3 once again work. This was a regression
  in Graphviz 14.1.3. #​2839
• Gvedit no longer leaves temporary files on disk when previewing.

v15.0.0

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Changed

• The MinGW packages no longer have libgd-dependent components enabled.
• Breaking: The diffimg utility has been removed.

v14.1.5

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Fixed

• The JSON renderer of the core plugin now understands a cluster to be indicated
  by the common rules, including the “cluster” prefix being case insensitive and
  the cluster=true attribute as an alternative. #​2187
• The description of what defines a cluster subgraph in the gc man page has
  been updated. #​2187
• When rendering multiple files at once (e.g.
  dot -Tsvg -O file1.dot file2.dot), page numbering state from previous jobs
  no longer leaks into the current job. This was a regression in
  Graphviz 2.40.0. #​2827
• Logic to determine whether a rendered page is non-first has been corrected.
• gvpr modulo expressions with an out-of-range modulo operand are now detected
  and result in an error message.
• When gvpr dumps switch statements as text, they are now printed as switch
  statements instead of an if-else ladder. This avoids incorrect interpretation
  of break statements in error messages. #​2822
• An out-of-bounds read access during gvpr type checking has been fixed.
• A null pointer dereference when freeing xdot objects has been fixed.

v14.1.4

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Changed

• Enable ascii plugin to be built using autotools. #​2828

Fixed

• Processing concentrate=true graphs no longer crashes Graphviz. Processing of
  concentrate=true graphs still often errors out. #​2825

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