Log Message:
graphics/graphviz: Update to 8.1.0

## [8.1.0] – 2023-07-06

### Added

- On non-Windows platforms, new `-Tvt100` and `-Tvt100-24bit` output formats
  are available that do rudimentary rendering to a terminal that supports ANSI
  escape sequences.
- Some notes about the interaction with wide-oriented streams were added to
  the cgraph man page.

### Changed

- When memory allocation failures cause Graphviz to exit, information about
  the failing allocation is included in the error message.

### Fixed

- Failure of arrowhead and arrowtail to respect penwidth #372 \
  Fixed also for the `curve` and `icurve`
  [edge arrow shapes](https://graphviz.org/doc/info/arrows.html#primitive-shapes).
- Iteration calculations based on `nslimit` and/or `nslimit1` attributes are
  clamped to `[0, INT_MAX]`. That is, calculations that result in a negative
  number of iterations are rounded up to `0` and those that result in a number
  of iterations that exceeds `INT_MAX` are rounded down to `INT_MAX`. Iteration
  numbers outside this range do not have useful behavior, but could be caused
  unintentionally by users.
- Setting `xdotversion` attributes that parse as greater than 17 (`xdotversion`
  is parsed as a series of digits, ignoring all non-digits) no longer causes an
  out of bounds read when rendering to xdot. #2390
- Icon size in the macOS Graphviz.app has been fixed so icons are no longer
  invisible.
- Compiling the portable source tarball on a machine with SWIG ≥ 4.1.0 no
  longer fails due to missing PHP files. #2388
- Syntax for a loop in `gvmap.sh` has been corrected. This was a regression in
  Graphviz 2.50.0. #2404