tesla 1.4.4 on Hex

Changelog

[#497] Tesla.Multipart Add return type Multipart.add_field/4 - by @ByeongUkChoi
[#493] Tesla.Middleware.Fuse Allow setting fuse ask mode - by @seancribbs
[#502] Tesla.Middleware.Telemetry Add Tesla.Env.t() to metadata - by @ibarchenkov
[#503] Tesla.Middleware.Retry Fix jitter - by @polvalente
[#486] Tesla.Middleware.Query Support nested list of tuples - by @ejscunha
[#496] Fix Client.adapter/1 nil check - by @dvic
[#491] Fix typos - by @kianmeng
[#489] Allow mime ~> 2.0 - by @maennchen