devel/py-gdbgui: Update to 0.7.8.2
This update has fixes/features added:

• bugfix in logic when jumping to source code line
• bugfix for when variable goes fromempty -> 1 element
• add CODE OF CONDUCT, CONTRIBUTING, and CHANGELOG files
• correctly display < and > in console widget
• show disassembly when file is unknown or missing
• improve logic when source code line should be jumped to
• escape brackets in disassembly, and gracefully hide missing opcodes
• update socketio version for more reliable websocket connection

Reviewed by: mat (mentor)
Approved by: mat (mentor)
Sponsored by: Netzkommune GmbH
Differential Revision: https://reviews.freebsd.org/D11457