cad/irsim: Update 9.7.119 => 9.7.121

Changelogs:

• https://github.com/RTimothyEdwards/irsim/compare/9.7.119...9.7.120
• https://github.com/RTimothyEdwards/irsim/compare/9.7.120...9.7.121

Approved by: db@, yuri@ (Mentors, implicit)
Differential Revision: https://reviews.freebsd.org/D54261