Closed issue by Bikutoso on void-packages repository

https://github.com/void-linux/void-packages/issues/33278

Description:
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### System

* xuname:  
  Void 5.13.19_1 x86_64 GenuineIntel notuptodate rrrmFFFF
* package:  
  anki-2.1.15_4
  python3-3.9.7_1

### Expected behavior
Entering an answer should show the result without any errors.
### Actual behavior
Gives this error after entering an answer.
```
Caught exception:
  File "/usr/share/anki/aqt/webview.py", line 322, in handler
    cb(val)
  File "/usr/share/anki/aqt/reviewer.py", line 461, in _onTypedAnswer
    self._showAnswer()
  File "/usr/share/anki/aqt/reviewer.py", line 217, in _showAnswer
    a = self._mungeQA(a)
  File "/usr/share/anki/aqt/reviewer.py", line 156, in _mungeQA
    return self.typeAnsFilter(mungeQA(self.mw.col, buf))
  File "/usr/share/anki/aqt/reviewer.py", line 306, in typeAnsFilter
    return self.typeAnsAnswerFilter(buf)
  File "/usr/share/anki/aqt/reviewer.py", line 362, in typeAnsAnswerFilter
    cor = parser.unescape(cor)
<class 'AttributeError'>: 'HTMLParser' object has no attribute 'unescape'
```
### Steps to reproduce the behavior
Enter an answer in any deck with new/due cards.
### Additional Information
Someone has already reported this bug to [Gentoo Linux](https://bugs.gentoo.org/795309), they have created a [patch](https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=267c5a6cdfd2d0e3839118d49598e92ac074d7b0) that does also work in Void.