Update Cargo.toml to fix "stats" feature issue

[dizda]

Hi,

I've this error since tokio v1.33.0:

    Updating crates.io index
error: failed to select a version for `tokio`.
    ... required by package `tokio-metrics v0.2.2`
    ... which satisfies dependency `tokio-metrics = "^0.2.2"` of package `tokio-metrics-collector v0.2.0`
    ... which satisfies dependency `tokio-metrics-collector = "^0.2.0"` of package `pr0m3th3us v0.1.0 (/Users/j/www/lopez/pr0m3th3us)`
    ... which satisfies path dependency `pr0m3th3us` (locked to 0.1.0) of package `node v0.5.1 (/Users/j/www/lopez/node)`
versions that meet the requirements `^1.26.0` are: 1.32.0, 1.34.0, 1.33.0, 1.31.0, 1.30.0, 1.29.1, 1.29.0, 1.28.2, 1.28.1, 1.28.0, 1.27.0, 1.26.0

the package `tokio-metrics` depends on `tokio`, with features: `stats` but `tokio` does not have these features.


all possible versions conflict with previously selected packages.

  previously selected package `tokio v1.34.0`
    ... which satisfies dependency `tokio = "^1.34.0"` of package `node v0.5.1 (/Users/j/www/lopez/node)`

failed to select a version for `tokio` which could resolve this conflict

cf. tokio-rs/tokio-metrics#55

This PR should fix the issue.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (9eb5863) 93.02% compared to head (de2f50e) 92.99%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #11      +/-   ##
==========================================
- Coverage   93.02%   92.99%   -0.04%     
==========================================
  Files           3        3              
  Lines         588      585       -3     
==========================================
- Hits          547      544       -3     
  Misses         41       41              

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[Hanaasagi]

Thank you!