There's a closed pull request on the void-packages repository

[ci skip] freecad: update to 0.20.1, update pyside to 5.15.5 and others related
https://github.com/void-linux/void-packages/pull/38856

Description:
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#### Testing the changes
- I tested the changes in this PR: **YES**

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#### Local build testing
- I built this PR locally for my native architecture (x86_64-musl) : **YES**
- I built this PR locally for these architectures (if supported. mark crossbuilds):
  - aarch64 (glibc): partial, since some packages can't be crossbuilded

#### Additional comments

* runtime test are OK, apart these related to pivy, see below
* superseeds PR #36356 regarding FreeCAD update
* about pivy: ~~some  SIGSEGV on running FreeCAD when it's using Coin/pivy.  
  See https://github.com/coin3d/pivy/issues/98  
  However, this is affecting current FreeCAD binary packaging too.~~  
  ~~Update: added patch on coin/pivy that fixed it~~  
  2nd update: bump pivy to 0.6.8 (just released) that includes this fix

ping @luzpaz @karl-nilsson @Piraty