There is an updated pull request by TinfoilSubmarine against master on the void-packages repository

https://github.com/TinfoilSubmarine/void-packages Twisted
https://github.com/void-linux/void-packages/pull/34098

python3-Twisted: update to 21.7.0.
<!-- Uncomment relevant sections and delete options which are not applicable -->

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

<!--
#### New package
- This new package conforms to the [quality requirements](https://github.com/void-linux/void-packages/blob/master/Manual.md#quality-requirements): **YES**|**NO**
-->

<!-- Note: If the build is likely to take more than 2 hours, please [skip CI](https://github.com/void-linux/void-packages/blob/master/CONTRIBUTING.md#continuous-integration)
and test at least one native build and, if supported, at least one cross build.
Ignore this section if this PR is not skipping CI.
-->
<!-- 
#### Local build testing
- I built this PR locally for my native architecture, (ARCH-LIBC)
- I built this PR locally for these architectures (if supported. mark crossbuilds):
  - aarch64-musl
  - armv7l
  - armv6l-musl
-->

I had to split `python-Twisted` and `python3-Twisted` into separate templates since the last verson of Twisted to support python2 is 20.3.0 (the current version in void-packages).

I tested this with `synapse` (and by dependency `python3-treq` as well) and have no issues. It looks like there are several others that should be checked...

`$ xbps-query -RX python3-Twisted`

- [x] alot-0.9.1_5
- [x] deluge-2.0.3_14
- [x] python3-TxSNI-0.2.0_2
- [x] python3-autobahn-21.3.1_2
- [x] python3-treq-20.3.0_4
- [x] python3-txtorcon-21.1.0_2
- [x] synapse-1.46.0_1
- [x] syncplay-1.6.9_2

A patch file from https://github.com/void-linux/void-packages/pull/34098.patch is attached