chore: bump ureq to 3.0

[sholderbach]

This supersedes #164

✔ Checklist:

• Commit messages have been written in Conventional Commits format;
• Tests for the changes have been added (for bug fixes / features).

[mgrachev]

@sholderbach 👋 Thank you for your contribution 👍

Please fix this comment:

Found PR title: chore: Bump `ureq` to 3.0
Error: PR title: subject must not be sentence-case, start-case, pascal-case, upper-case
Error: PULL REQUEST: PR title does not conform to the conventional commit spec

[sholderbach]

Lowercased it