fix: Allow short closed elements

[tefra]

📒 Description

Resolves #xxxx

🔗 What I've Done

Write a description of the steps taken to resolve the issue

💬 Comments

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🛫 Checklist

• Updated docs
• Added unit-tests
• Sample tests pass
• W3C tests pass

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov]

Codecov Report

Attention: Patch coverage is 87.50000% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 99.97%. Comparing base (eab6bb7) to head (2a9eb1c).

Files	Patch %	Lines
...sdata/formats/dataclass/serializers/tree/mixins.py	87.50%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##              main    #1027      +/-   ##
===========================================
- Coverage   100.00%   99.97%   -0.03%     
===========================================
  Files          117      117              
  Lines         9272     9278       +6     
  Branches      2194     2196       +2     
===========================================
+ Hits          9272     9276       +4     
- Partials         0        2       +2     

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