chore(release): Bump pyproject.toml tag to 0.1.15

[Tom-Owen-ONS]

📌 Pull Request Template

Please complete all sections

✨ Summary

Small change to pyproject before tagging the release.

📜 Changes Introduced

• Bump pyproject.toml tag to 0.1.15

• Feature implementation (feat:) / bug fix (fix:) / refactoring (chore:) / documentation (docs:) / testing (test:)

• Updates to tests and/or documentation

• Terraform changes (if applicable)

✅ Checklist

Please confirm you've completed these checks before requesting a review.

• Code is formatted using Black
• Imports are sorted using isort
• Code passes linting with Ruff, Pylint, and Mypy
• Security checks pass using Bandit
• API and Unit tests are written and pass using pytest
• Terraform files (if applicable) follow best practices and have been validated (terraform fmt & terraform validate)
• DocStrings follow Google-style and are added as per Pylint recommendations
• Documentation has been updated if needed

🔍 How to Test

Confirm version is correct in pyproject.toml

Note: It could be worth exploring release-please for the new merged repos. The CHANGELOG.md isn't being maintained in this repo and using this tool would automate this for us and ensure it's always updated.