Update rocket requirement from =0.5.0-rc.3 to =0.5.0-rc.4

[dependabot[bot]]

Updates the requirements on rocket to permit the latest version.

Changelog

Sourced from rocket's changelog.

Version 0.5.0-rc.4 (Nov 1, 2023)

Major Features and Improvements

• Introduced request connection upgrade APIs.

  The APIs allow responders to handle upgrade requests by registering IoHandlers for upgraded protocols. The IoHandler can perform raw byte I/O with the client. This functionality is used to implement WebSocket support by the newly introduced rocket_ws library.

• Introduced WebSocket support: rocket_ws.

  The newly introduced rocket_ws contrib library -- entirely external to Rocket itself -- provides complete, multi-modal support for interacting with clients over WebSockets. Modalities include async streams:

  #[get("/echo?compose")]
  fn echo_compose(ws: ws::WebSocket) -> ws::Stream!['static] {
      ws.stream(|io| io)
  }
  

  And generator syntax, among others:

  #[get("/echo?stream")]
  fn echo_stream(ws: ws::WebSocket) -> ws::Stream!['static] {
      ws::Stream! { ws =>
          for await message in ws {
              yield message?;
          }
      }
  }
  

Breaking Changes

• The types of responders in [response::status] were unified to all be of the form Status<R>(R).

  Previously, some responders were of the form Status<R>(Option<R>).

• [Custom form errors] must now specify an associated Status.

... (truncated)

Commits

• 24ca5e8 New version: 0.5.0-rc.4.
• 208848d Add CHANGELOG for 0.5.0-rc.4.
• 2ae91b9 Update UI tests.
• 11fed5a Document '&[u8]' form/data guard, limits.
• 8ed64d0 Fix typo in pastebin tutorial: 'route' -> 'wrote'.
• 6f9d671 Add a "clear message" button to cookies example.
• 654b1c3 Set 'SameSite' to 'Lax' on removal cookies.
• df3a4e0 Qualm various emerging unused warnings.
• 186ec84 Improve forwarding status code precision.
• b6430e9 Rename 'Outcome::Failure' to 'Outcome::Error'.
• Additional commits viewable in compare view

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