Bump iri-string to 0.5.0 and use shorter type names

[lo48576]

This PR bumps the internal dependency to iri-string crate to the latest stable version.

(Disclaimer: I am the author of iri-string crate.)

Motivation

• The new version performs a little better.
  • URI resolution is made roughly 3x faster (by quite simple and naive benchmark).
• The new version has no mandatory dependencies.
  • Dependencies to nom and its indirect deps are removed since v0.5.0.
  • axum still depends on nom, but tokio-http no longer does.
• Updating the dependency is happy :-).
  • The crate and its items are completely internal, so updating won't cause compatibility issues.

Solution

Just bump the iri-string dependency.

[lo48576]

Sorry, I overlooked that MSRV of this project is 1.51...

[davidpdrsn]

@lo48576 what is iri-string's MSRV? As long as we don't go above 1.54 which is axum's MSRV then its probably fine to bump it. We could even bump the MSRV for axum if necessary, as long as its not to the most recent version.

[lo48576]

iri-string's MSRV is 1.58.0 (released at 2022-01-13).
I can try to lower iri-string's MSRV, but I'm not sure it is worth doing.

[lo48576]

iri-string 0.5.0 uses String::try_reserve which is stabilized since 1.57.0, so MSRV won't go below that...

[tesaguri]

tower-http's MSRV is now 1.60 (#306) so I believe this pull request can be reopened.

[lo48576]

Thank you for notifying me. I created #312 for bumping iri-string to the newer version.