fix: Display offset field as int for starknet_getCompiledCasm endpoint

[hudem1]

Solves issue #2393

[codecov]

Codecov Report

Attention: Patch coverage is 5.26316% with 18 lines in your changes missing coverage. Please review.

Project coverage is 73.35%. Comparing base (81bd135) to head (01d0a7c).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
rpc/v8/compiled_casm.go	5.26%	18 Missing ⚠️

❌ Your patch status has failed because the patch coverage (5.26%) is below the target coverage (60.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2456      +/-   ##
==========================================
- Coverage   73.36%   73.35%   -0.02%     
==========================================
  Files         142      142              
  Lines       17065    17200     +135     
==========================================
+ Hits        12520    12617      +97     
- Misses       3672     3699      +27     
- Partials      873      884      +11     

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[wojciechos]

Oh, sorry. I forgot to close the issue. This change was actually reverted in the latest rc-3 spec: starkware-libs/starknet-specs#275.