[Snyk] Fix for 3 vulnerabilities

[mitchelllisle]

Snyk has created this PR to fix 3 vulnerabilities in the pip dependencies of this project.

Snyk changed the following file(s):

• requirements/dev.txt

⚠️ Warning

flake8 5.0.4 has requirement importlib-metadata<4.3,>=1.1.0; python_version < "3.8", but you have importlib-metadata 6.7.0.

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• Some vulnerabilities couldn't be fully fixed and so Snyk will still find them when the project is tested again. This may be because the vulnerability existed within more than one direct dependency, but not all of the affected dependencies could be upgraded.

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Pull Request Overview

This PR adds a security dependency pin for urllib3 to address a vulnerability identified by Snyk. The change ensures that the project uses urllib3 version 2.5.0 or higher in the development environment.

Key Changes:

• Added urllib3>=2.5.0 to development dependencies for security compliance

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