net/wireshark: Update to 4.2.0

See https://www.wireshark.org/docs/relnotes/wireshark-4.2.0.html for a
list of changes in this release.

Of note to FreeBSD users, wireshark now uses Qt6 (rather than 5), and
development files (e.g., headers), while installed by default can be
disabled by unchecking the DEVELOPMENT option.