Update dependencies in pyproject.toml and setup.py

[stephen-huan]

This PR

• Move urllib3 from dependencies to testinternet

  • It appears urllib3 is only used in contrib/internet-urllib3.py, so put it with certifi in the testinternet optional-dependencies group.

• Add PySocks optional-dependencies

  • PySocks is used for the optional proxy feature, so add it to optional-dependencies.

• Change keyring[keyring] -> keyring in setup.py

  • For consistency with pyproject.toml and requirements-keyring.txt.

• I've read the DCO.

• I've read the Coding Guidelines

• The relevant informations about the changes stands in the commit message, not here in the message of the pull request.

• Code changes follow the style of the files they change.

• Code is tested (provide details).

References

Additional information

[Copilot]

Pull request overview

This PR reorganizes dependencies to better reflect their actual usage patterns. urllib3 is moved from core dependencies to the testinternet optional dependency group since it's only used in test/contrib code, and PySocks is added as a new optional dependency for proxy support.

Changes:

• Moved urllib3 from main dependencies to testinternet optional dependencies
• Added PySocks as a new optional dependency for proxy support
• Changed keyring[keyring] to keyring in setup.py for consistency
• Alphabetically sorted optional dependencies in both pyproject.toml and setup.py

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
setup.py	Removed urllib3 from install_requires, updated extras_require to add pysocks and move urllib3 to testinternet, changed keyring[keyring] to keyring, alphabetized extras
pyproject.toml	Removed urllib3 from dependencies, added pysocks to optional-dependencies, moved urllib3 to testinternet optional-dependencies, alphabetized optional-dependencies
requirements-testinternet.txt	Added urllib3~=1.25.9 to match the new testinternet optional dependency
requirements-pysocks.txt	New file containing pysocks dependency for the new pysocks optional dependency

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