Convert warnings into errors in tests

[huong-li-nguyen]

Description

Following up on #194 - only 2 warnings were converted to errors:

UserWarning: Importing LLMChain from langchain root module is no longer supported. Please use langchain.chains.LLMChain instead. 

HTTPResponse.getheader() is deprecated and will be removed in urllib3 v2.1.0. Instead use HTTPResponse.headers.get(name, default)

• The first one is fixed by simply changing the import statement in vizro-ai
• This second one is coming from dash[testing] as we use dash_duo for our tests only. The deprecation warning seems to be fixable by upgrading selenium to 4.6. However, dash[testing] has an upper bound on selenium and an issue has already been created on dash being aware of the deprecation warning (though I am not sure if they release the upper bound anytime soon). For now, I would just suggest to ignore it.

Screenshot

Checklist

• I have not referenced individuals, products or companies in any commits, directly or indirectly
• I have not added data or restricted code in any commits, directly or indirectly
• I have updated the docstring of any public function/class/model changed
• I have added tests to cover my changes (if applicable)

Types of changes

• Docs/refactoring (non-breaking change which improves codebase)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

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[maxschulz-COL]

Makes sense, thanks for taking care of this

[petar-qb]

Makes sense!