Bump sled from 0.21.3 to 0.22.0

[dependabot-preview]

Bumps sled from 0.21.3 to 0.22.0.

Commits

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[codecov]

Codecov Report

Merging #35 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #35   +/-   ##
=======================================
  Coverage   71.04%   71.04%           
=======================================
  Files          59       59           
  Lines        3167     3167           
=======================================
  Hits         2250     2250           
  Misses        917      917

[tomtau]

this should be all right, as the change in sled seems to be just internal API around IVec -- I'll let you @devashishdxt double-check this.
Note that these code coverage change fluctuations are due to quickcheck randomness: https://github.com/crypto-com/chain/blob/master/chain-abci/src/storage/merkle.rs#L142 we may try to configure it, such as the coverage remains the same, or add a few separate unit tests