Added requirements.txt to doc build environment

[emanlove]

User description

For the API documentation as sphinx autogenerates the api docs from the code it needs the dependent Python packages. This change adds those to the tox docs build environment.

Description

This adds the requirments.txt to the tox docs build environment.

Motivation and Context

The Sphinx Python API docs are built by "reading the code". That is as if Python were importing or running it. Thus the required
dependencies to run the Python bindings are also require to build the API documentation.

Types of changes

• 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)

Checklist

• I have read the contributing document.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

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PR Type

Bug fix, Documentation

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Description

• Added requirements.txt to the dependencies list in the tox configuration to ensure all necessary packages are available for building the API documentation with Sphinx.
• This change addresses an issue where the Sphinx Python API documentation build process requires the dependent Python packages.

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Changes walkthrough 📝

	Relevant files
Configuration changes	tox.ini Include `requirements.txt` in tox documentation build environment py/tox.ini Added requirements.txt to the dependencies list in the tox configuration. +1/-0

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PR Reviewer Guide 🔍

⏱️ Estimated effort to review [1-5]	1
🧪 Relevant tests	No
🔒 Security concerns	No
⚡ Key issues to review	None

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PR Code Suggestions ✨

Category	Suggestion	Score
Possible issue	Ensure the path to requirements.txt is correct to avoid file not found errors Ensure that the requirements.txt file is located in the correct directory relative to the tox.ini file, or provide an absolute path to avoid potential file not found errors. py/tox.ini [9] --r requirements.txt +-r path/to/requirements.txt Apply this suggestion Suggestion importance[1-10]: 7 Why: This suggestion is relevant as it addresses a potential runtime error if the requirements.txt file is not found. It's a practical improvement for ensuring the build process does not fail.	7
Best practice	Pin versions of dependencies in requirements.txt to ensure consistent builds Consider pinning the versions of the dependencies listed in requirements.txt to ensure consistent builds across different environments. py/tox.ini [9] -r requirements.txt +# Ensure versions are pinned in requirements.txt Apply this suggestion Suggestion importance[1-10]: 6 Why: The suggestion to pin versions in requirements.txt is a good practice to ensure consistent environments, although it does not directly modify the PR code but rather the contents of another file. It's indirectly related to the PR changes.	6

[iampopovich]

@emanlove I applied the changes in my PR, and the documentation was generated without any dependency errors. Thank you.