math/wxmaxima: Update to 26.07.0

ChangeLog:

• https://github.com/wxMaxima-developers/wxmaxima/releases/tag/Version-26.07.0
• https://github.com/wxMaxima-developers/wxmaxima/releases/tag/Version-26.06.2
• https://github.com/wxMaxima-developers/wxmaxima/releases/tag/Version-26.06.1
• https://github.com/wxMaxima-developers/wxmaxima/releases/tag/Version-26-06.0
• https://github.com/wxMaxima-developers/wxmaxima/releases/tag/Version-26.05.0

MFH: 2026Q2
(cherry picked from commit 3be6a0f4f730462691da5ce843704a8ab9936268)