Remove forge-std submodule in katana

[ZaK3939]

Description

Removed the [submodule "crates/katana/primitives/contracts/messaging/solidity/lib/forge-std"] section from the .gitmodules file.

[glihm]

Thanks for the PR @ZaK3939 and this fix.

Question, is the git issue resolved with this being removed? And you can use sozo init without any problem?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.80%. Comparing base (9f8147d) to head (d6201cb).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1974   +/-   ##
=======================================
  Coverage   69.80%   69.80%           
=======================================
  Files         313      313           
  Lines       35527    35527           
=======================================
+ Hits        24799    24801    +2     
+ Misses      10728    10726    -2     

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[ZaK3939]

yes, sozo init is ok in current branch.
should be removed unused submodule to avoid future same error.