fix: a Rust linter warning

[larry0x]

The use ics23; statement in the no-std check crate triggers the following linter warning:

warning: this import is redundant
 --> no-std-check/src/lib.rs:9:1
  |
9 | use ics23;
  | ^^^^^^^^^^ help: remove it entirely
  |
  = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_component_path_imports
  = note: `#[warn(clippy::single_component_path_imports)]` on by default

This can be fixed by changing it to use ics23::*;.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 65.55%. Comparing base (1363533) to head (ca29ba9).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #359   +/-   ##
=======================================
  Coverage   65.55%   65.55%           
=======================================
  Files           7        7           
  Lines        3609     3609           
=======================================
  Hits         2366     2366           
  Misses       1243     1243           

Flag	Coverage Δ
rust	65.55% <ø> (ø)

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