Add manually-triggered release workflow (version bump + PyPI publish)

[jakehadar]

Summary

• New .github/workflows/release.yml, triggered manually via workflow_dispatch with a bump_type input (patch/minor/major, default patch)
• Runs pytest as a gate before doing anything irreversible
• bumpversion <bump_type> bumps .bumpversion.cfg, commits ("Bump version: X -> Y"), and tags — pushed back to master
• Builds sdist + wheel via python -m build, publishes to PyPI via Trusted Publishing (OIDC — no API token stored as a secret)
• Creates a GitHub Release for the new tag with the built artifacts attached
• Removes the old local python setup.py upload command (UploadCommand in setup.py) and its now-unused imports/helper, since this workflow fully replaces it

Before merging / first run

• PyPI-side setup required: on the gbfs-client PyPI project page, under Publishing → Trusted Publishers, add a trusted publisher pointing at this repo (jakehadar/bikeshare-client-python) and workflow filename (release.yml). Without this, the publish step will fail authentication.
• Repo Actions permissions: confirm Settings → Actions → General → Workflow permissions is set to "Read and write permissions" (needed for the workflow to push the version bump commit/tag back to master).
• I added environment: release to the job — optional, but lets you add required reviewers on that environment (Settings → Environments) as an extra manual approval gate before a publish actually runs, since this is the one workflow in the repo that does something irreversible.

Test plan

• Verified setup.py still installs, tests pass, and both sdist/wheel build cleanly after removing UploadCommand (fresh venv, Python 3.13)
• Verified bumpversion patch behaves as expected (0.1.8 -> 0.1.9, correct commit message and tag) in an isolated throwaway clone — didn't touch this repo's real tags
• Workflow YAML parses correctly
• End-to-end dispatch run (can't trigger this from here — needs the PyPI trusted publisher configured first, then a manual run from the Actions tab)

Refs #18

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