deps: Update dependencies 2021-05-08

[ClementTsang]

Description

A description of the change and what it does. If relevant (such as any change that modifies the UI), please provide screenshots of the change:

Did not update crossterm (and tui-rs) since it seems to have resulted in a massive CPU usage increase. Also fix minor clippy error with a duplicated to_string call.

Issue

If applicable, what issue does this address?

Closes: #

Type of change

Remove the irrelevant ones:

• Refactoring (a change that doesn't change application functionality)

Test methodology

If relevant, please state how this was tested:

Furthermore, please tick which platforms this change was tested on:

• Windows
• macOS
• Linux

If relevant, all of these platforms should be tested.

Checklist

If relevant, ensure the following have been met:

• Change has been tested to work, and does not cause new breakage unless intended
• Code has been self-reviewed
• Documentation has been added/updated if needed (README, help menu, etc.)
• Passes CI pipeline (clippy check and cargo test check)
• Areas your change affects have been linted using rustfmt (cargo fmt)
• No merge conflicts arise from the change

Other information

Provide any other relevant information to this change: