Upgrade to new major version of `ureq`

[sholderbach]

Since ureq upgraded to the new 3.0 major version we would like to use that with Nushell (nushell/nushell#16078). As part of that we would like to upgrade update-informer to a version that uses ureq 3.0 for the ureq client-backend.

I prepared #169 that tries to account for the breaking changes with the upgrade. Primarily the change to ureq using http crate components in the public API and the change how the timeout mechanims are configured.

As the internals of the http client are hidden a new release with that shouldn't expose a breaking change IIRC. (Only side effect that cargo update could duplicate the dependency for some until other crates upgrade)

[mgrachev]

@sholderbach 👋

Just released a new version of update-informer - v1.3.0.
And created a PR to bump a version in Nushell.

[sholderbach]

Awesome, thanks!