Bump MSRV to 1.57.0 to more correctly match the codebase.

[martinfrances107]

As the code has been updated new features that break the currently stated MSRV have been added.

I just want the codebase to reflect reality.

This issue can be seen by running cargo clippy

warning: current MSRV (Minimum Supported Rust Version) is `1.56.0` but this item is stable since `1.57.0`
   --> src/traits.rs:649:10
    |
649 |     self.as_slice()
    |          ^^^^^^^^^^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#incompatible_msrv
    = note: `#[warn(clippy::incompatible_msrv)]` on by default

[codspeed-hq]

CodSpeed Performance Report

Merging #1760 will degrade performances by 14.2%

_{Comparing martinfrances107:bump_MSRV (367c529) with main (2560d5c)}

Summary

⚡ 1 improvements
❌ 1 regressions
✅ 22 untouched benchmarks

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	main	martinfrances107:bump_MSRV	Change
❌	recognize float str	1 µs	1.2 µs	-14.2%
⚡	number	287.2 ns	259.4 ns	+10.71%

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 61.42%. Comparing base (2560d5c) to head (367c529).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1760      +/-   ##
==========================================
- Coverage   61.47%   61.42%   -0.05%     
==========================================
  Files          24       23       -1     
  Lines        2951     2950       -1     
==========================================
- Hits         1814     1812       -2     
- Misses       1137     1138       +1     

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[martinfrances107]

looking at the 14% drop in preformance ( A change to 1 µs to 1.2 µs ) well that looks completely to be expect from from repeatibility noise.

The +10% imrpovement ( from 287.2 ns to 259.4 ns ) is a welcome minor improvement

In short, I think being blocked on this is misguided.

[Geal]

chill a bit. Benchmarks can be flaky, that's not an issue, and this change definitely cannot affect performance