[jsonbailey]

Summary

Remove dependencies that nothing in this repo uses. The docs entries look copied from python-server-sdk's dependency list.

• dev: mock. No code imports the mock package; tests use unittest.mock and local mock classes.
• docs: backoff, expiringdict, pyrfc3339, jsonpickle, semver. None is imported by the package, tests, contract tests, or docs/conf.py, and none is a Sphinx extension.
• docs: urllib3. It is a runtime dependency, and uv sync --group docs installs the project, so the docs build already gets it.

Checked imports in ld_eventsource/, contract-tests/, docs/conf.py, the Makefile, CI workflows, and .readthedocs.yml. make lint, make test (147 passed), and make docs (Sphinx with -W) all pass.

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Note

Overview
Trims dependency-groups in pyproject.toml so install/sync only pulls packages this repo actually uses.

dev: drops mock (tests rely on unittest.mock, not the standalone mock package). docs: removes backoff, expiringdict, pyrfc3339, jsonpickle, semver, and urllib3 from the docs group—none are imported by the library, tests, contract tests, or Sphinx config; urllib3 remains a normal runtime dependency and is still available when building docs via the project install.

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