Sync python-selenium with the updated tutorial

[realpython-bot]

Re-pins python-selenium/requirements.txt (and refreshes uv.lock) to match the tutorial's maintenance update, which bumps the tested-with Selenium pin from 4.48.0 to 4.50.0 (current PyPI release). The previous materials pins were selenium==4.29.0. Transitive dependencies are re-pinned to their current releases (attrs 26.1.0, certifi 2026.7.22, h11 0.16.0, idna 3.20, trio 0.34.0, typing-extensions 4.16.0, urllib3 2.8.0, websocket-client 1.9.2, wsproto 1.3.2). No code changes.

• Article draft (admin): https://realpython.com/pbjt/blog/post/2323/change/
• Maintenance card: https://trello.com/c/FSvmrO1A

Verification

• Fresh Python 3.14 venv with pip install -r requirements.txt .: every bandcamp module imports cleanly on Selenium 4.50.0.
• training/navigation.py runs green with headless Firefox (Selenium Manager fetched the browser and driver).
• uvx ruff@0.14.1 format --check and ruff check pass.
• Heads-up, not caused by this PR: training/interaction.py and observation.py (#view-more could not be scrolled into view) and the discover app (div.meta p a not found) fail identically on the old 4.29.0 pins. The cause is live Bandcamp DOM drift, which needs a separate code update. communication.py needs a display (non-headless), so it couldn't run on the CI box.

Update: locator fix for Bandcamp's redesign (commit 0d022d2)

The DOM drift noted above is now fixed, matching the full update of the article draft:

• locators.py: track locators point at the new card markup (a.stretch-link, div.title, div.attribution-meta, div.info-pill), and the cookie dialog uses div.cookie-control.
• training/navigation.py, communication.py, observation.py: same locator changes. observation.py now waits for #view-more to be clickable before clicking, because the closing cookie dialog otherwise races the click.
• base.py: drops the implicit wait, so the page objects use explicit waits only.
• pyproject.toml pins selenium==4.50.0, and the README uses the discover command and mentions Selenium Manager.

Verified on Python 3.14.6, Selenium 4.50.0, Firefox 157.0.1, and geckodriver 0.37.1: the training scripts and the discover app (tracks, play, pause, more, exit) all run against the live site. ruff format --check and ruff check pass.

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