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

A place to write any comments to the reviewer.

🛫 Checklist

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

[sonarcloud[bot]]

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[bot]]

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 :warning:

Additional details and impacted files

```diff @@ 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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