Fuzzfetch

download_url` now handles unknown size downloads

Add timeout to download functions. Default timeout is 30s.

What's Changed
* Drop Python 3.7 & update CI by jschwartzentruber in https://github.com/MozillaSecurity/fuzzfetch/pull/123
* Allow downloading builds which lack crashreporter symbols by pyoor in https://github.com/MozillaSecurity/fuzzfetch/pull/124


**Full Changelog**: https://github.com/MozillaSecurity/fuzzfetch/compare/2.4.0...2.4.1

What's Changed
* Add support for downloading mozharness. by pyoor in https://github.com/MozillaSecurity/fuzzfetch/pull/122

**Full Changelog**: https://github.com/MozillaSecurity/fuzzfetch/compare/2.3.0...2.4.0

What's Changed
* Use codecov uploader. by jschwartzentruber in https://github.com/MozillaSecurity/fuzzfetch/pull/120
* Remove dependence on target.mozinfo.json by pyoor in https://github.com/MozillaSecurity/fuzzfetch/pull/121


**Full Changelog**: https://github.com/MozillaSecurity/fuzzfetch/compare/2.2.2...2.3.0