Update to Octocrab 0.38.0

[mayanez]

Hi!

I'm new to rust so if there's anything that I did wrong please let me know.

I've updated Octocrab to 0.38.0 mainly for the opentls feature. The reason is that rustls does not support native certificates without https://github.com/rustls/rustls-native-certs. Octocrab doesn't seem to have this as a feature option, but does have opentls which works correctly.

The issue I was facing was the same as described in other threads (eg. https://github.com/moonrepo/proto/issues/204) due to being behind a corporate proxy. See below for the error:

 HTTP Error: error sending request for url (https://api.github.com/user): error trying to connect: invalid peer certificate:
      UnknownIssuer

With this update everything works as expected. Looking forward to using your tool!