chore: Bump release 0.6.4

[ruivieira]

Summary by Sourcery

Bump the project to release version 0.6.4 across code and documentation.

Enhancements:

• Update internal version constant to 0.6.4.

Build:

• Update project version in pyproject.toml to 0.6.4.

Documentation:

• Update README version badge to reflect release 0.6.4.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This PR updates the project to release version 0.6.4 by consistently bumping the version string across documentation and source metadata.

File-Level Changes

Change	Details	Files
Bump project version from 0.6.3 to 0.6.4 across metadata and documentation.	Update the version badge in the README to display 0.6.4. Update the project version field in pyproject.toml to 0.6.4. Update the version constant in the Python package to 0.6.4.	README.md pyproject.toml src/trustyai/version.py

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[sourcery-ai]

Hey - I've found 1 issue

Prompt for AI Agents

Please address the comments from this code review:

## Individual Comments

### Comment 1
<location path="README.md" line_range="1" />
<code_context>
-![version](https://img.shields.io/badge/version-0.6.3-green) [![Tests](https://github.com/trustyai-python/module/actions/workflows/workflow.yml/badge.svg)](https://github.com/trustyai-python/examples/actions/workflows/workflow.yml)
+![version](https://img.shields.io/badge/version-0.6.4-green) [![Tests](https://github.com/trustyai-python/module/actions/workflows/workflow.yml/badge.svg)](https://github.com/trustyai-python/examples/actions/workflows/workflow.yml)

 # python-trustyai
</code_context>
<issue_to_address>
**question:** The tests badge image and its link target reference different repositories; is this intentional?

The badge image uses the `trustyai-python/module` workflow, but the link targets `trustyai-python/examples`. If this isn’t intentional, consider updating them to reference the same repository/workflow for consistency.
</issue_to_address>

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[sourcery-ai]

question: The tests badge image and its link target reference different repositories; is this intentional?

The badge image uses the trustyai-python/module workflow, but the link targets trustyai-python/examples. If this isn’t intentional, consider updating them to reference the same repository/workflow for consistency.