fix: support Solidity ^0.8.31 compilation for osaka fork

[sanbir]

Summary

Playground compilation on fork=osaka fails for contracts requiring newer Solidity versions (for example pragma solidity ^0.8.31) and Osaka opcodes like clz.

Reproduction

1. Open /playground?fork=osaka
2. Compile a contract with pragma solidity ^0.8.31 and inline assembly clz
3. Current behavior: compiler version mismatch / Osaka-specific code cannot compile

Expected

Compilation should succeed on Osaka playground with a compiler supporting ^0.8.31, and evmVersion should remain Osaka-compatible.

Notes

Related prior thread: #229 (Shanghai version mismatch, now closed).