refactor Cargo.toml

[byeongsu-hong]

No description provided.

[codecov-commenter]

Codecov Report

Merging #42 (4e1b185) into main (d78fcc6) will increase coverage by 0.05%.
Report is 1 commits behind head on main.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main      #42      +/-   ##
==========================================
+ Coverage   62.95%   63.00%   +0.05%     
==========================================
  Files          55       55              
  Lines        1231     1230       -1     
==========================================
  Hits          775      775              
+ Misses        456      455       -1     

Files	Coverage Δ
contracts/mailbox/src/core.rs	12.82% <ø> (ø)
integration-test/tests/contracts/cw/setup.rs	0.00% <ø> (ø)

... and 1 file with indirect coverage changes