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

Electron-Cash: update to 4.2.10.
https://github.com/void-linux/void-packages/pull/37568

Description:
#### Testing the changes
- I tested the changes in this PR: **briefly** (I'm not very familiar with this software, but all essential functionality seems to be present)

#### Local build testing
- I built this PR locally for my native architecture, (x86_64-glibc)

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The currently packaged version, 4.2.3, crashes at launch due to [this bug](https://github.com/Electron-Cash/Electron-Cash/issues/2368).

A new dependency, `python3-pathvalidate` is added ~~in #37549~~.