Add validator to catch datetime azure_openai.version

[rishimo]

🤔 Why?

If the azure_openai.version set in the app is a regular version e.g. 2024-06-01 instead of a -preview version it can be misinterpreted as a datetime when the config is loaded, causing validation errors.

🤓 What?

Adds a validator to force datetime to string to catch pesky validation errors.

🧪 Tested?

Connector tested locally with a YAML file generated by app, runs successfuly.

☑️ Checks

• My PR contains actual code changes, and I have updated the version number in pyproject.toml.

[mars-lan]

YAML FTW!

[github-actions]

☂️ Python Coverage

current status: ✅

Overall Coverage

Lines	Covered	Coverage	Threshold	Status
11819	10495	89%	85%	🟢

New Files

No new covered files...

Modified Files

File	Coverage	Status
metaphor/common/embeddings_config.py	94%	🟢
TOTAL	94%	🟢

updated for commit: 44567e7 by action🐍

[codecov]

Codecov Report

Attention: Patch coverage is 87.50000% with 1 line in your changes missing coverage. Please review.

Project coverage is 88.79%. Comparing base (441755b) to head (44567e7).
Report is 1 commits behind head on main.

Files	Patch %	Lines
metaphor/common/embeddings_config.py	87.50%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #958      +/-   ##
==========================================
- Coverage   88.80%   88.79%   -0.01%     
==========================================
  Files         182      182              
  Lines       11813    11819       +6     
==========================================
+ Hits        10490    10495       +5     
- Misses       1323     1324       +1     

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