Add timeout argument to all `requests` calls

[droserasprout]

Description

Fixes bug where some plugin commands hang indefinitely. 8 years have passed since opening https://github.com/psf/requests/issues/3070, and we still have to deal with this stuff 😔 10 seconds value have been chosen as it's used multiple times in the codebase.

To Do

• [x] ~Documentation. (If you've added a new command-line flag, for example, find the appropriate page under docs/ to describe it.)~
• [x] Changelog. (Add an entry to docs/changelog.rst to the bottom of one of the lists near the top of the document.)
• [x] ~Tests. (Very much encouraged but not strictly required.)~

[catap]

Seems like a fix for https://github.com/beetbox/beets/issues/4103

[Serene-Arc]

lgtm!