Fix compilation error on 32bit target
Fix compilation error on 32bit target

> Tests/YamsTests/ConstructorTests.swift:127:29: error: integer literal '9223372036854775807' overflows when stored into 'Int'
>            "canonicalMax": 9223372036854775807
>                            ^
> Tests/YamsTests/ConstructorTests.swift:126:29: error: integer literal '-9223372036854775808' overflows when stored into 'Int'
>            "canonicalMin": -9223372036854775808,
>                            ^

jpsim/Yams,jpsim/Yams,jpsim/Yams