Update Rust crate rocket to 0.5.0-rc.2

v0.5.0-rc.2

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Major Features and Improvements

• Introduced [rocket_db_pools] for asynchronous database pooling.
• Introduced support for [mutual TLS] and client [Certificate]s.
• Added a [local_cache_once!] macro for request-local storage.
• Added a v0.4 to v0.5 migration guide and FAQ to Rocket's website.
• Introduced shutdown fairings.

Breaking Changes

• Hash impls for MediaType and ContentType no longer consider media type parameters.
• TLS config values are only available when the tls feature is enabled.
• [MediaType::with_params()] and [ContentType::with_params()] are now builder methods.
• Content-Type [content] responder type names are now prefixed with Raw.
• The content::Plain responder is now called content::RawText.
• The content::Custom<T> responder was removed in favor of [(ContentType, T)][(ContentType, T)].
• TLS config structs are now only available when the tls feature is enabled.
• Removed CookieJar::get_private_pending() in favor of [CookieJar::get_pending()][CookieJar::get_pending()].
• The [local_cache!] macro accepts fewer types. Use [local_cache_once!] as appropriate.
• When requested, the FromForm implementations of Vec and Maps are now properly lenient.
• To concord with browsers, the [ and ] characters are now accepted in URI paths.
• The [ and ] characters are no longer encoded by [uri!].
• [Rocket::launch()][Rocket::launch()] allows Rocket recovery by returning the instance after shutdown.
• ErrorKind::Runtime was removed; [ErrorKind::Shutdown][ErrorKind::Shutdown] was added.

General Improvements

• [Rocket] is now #[must_use].
• Support for HTTP/2 can be disabled by disabling the default http2 crate feature.
• Added [rocket::execute()][rocket::execute()] for executing Rocket's launch() future.
• Added the [context!] macro to [rocket_dyn_templates] for ad-hoc template contexts.
• The time crate is re-exported from the crate root.
• The FromForm, Responder, and UriDisplay derives now fully support generics.
• Added helper functions to serde submodules.
• The [Shield] HSTS preload header now includes includeSubdomains.
• Logging ignores write! errors if stdout disappears, preventing panics.
• Added [Client::terminate()][Client::terminate()] to run graceful shutdown in testing.
• Shutdown now terminates the async runtime, never the process.

HTTP

• Introduced [Host] and the [&Host] request guard.
• Added Markdown (text/markdown) as a known media type.
• Added [RawStr::percent_encode_bytes()].
• NODELAY is now enabled on all connections by default.
• The TLS implementation handles handshakes off the main task, improving DoS resistance.

Request

• Added [Request::host()] to retrieve the client-requested host.

Trait Implementations

• Arc<T>, Box<T> where T: Responder now implement Responder.
• [Method] implements Serialize and Deserialize.
• [MediaType] and [ContentType] implement Eq.

Updated Dependencies

• The time dependency was updated to 0.3.
• The handlebars dependency was updated to 4.0.
• The memcache dependency was updated to 0.16.
• The rustls dependency was updated to 0.20.

Infrastructure

• Rocket now uses the 2021 edition of Rust.