Workaround genco bug (#145)

[giladchase]

Looks like genco = 0.17.7 from last month breaks compilation. This didn't pop up yet because of our committed Cargo.lock, but since we publish blockifier as a lib-crate, it runs an update when we publish.

We had to do this on Starknet API here as well: starkware-libs/starknet-api#145

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This change is 

[codecov-commenter]

Codecov Report

Merging #1089 (10e2a82) into main (4478a79) will not change coverage.
Report is 1 commits behind head on main.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1089   +/-   ##
=======================================
  Coverage   67.50%   67.50%           
=======================================
  Files          51       51           
  Lines        6494     6494           
  Branches     6494     6494           
=======================================
  Hits         4384     4384           
  Misses       1726     1726           
  Partials      384      384           

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[elintul]

Reviewed 2 of 2 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @dan-starkware)