Set prague as the default EVM version

[matheusaaguiar]

Last PR (Cancun) for reference: #14907

[cameel]

Would be helpful to always link these PRs to the one from the last time we did it (#14907 in this case). It's always good to compare the two to make sure nothing was missed.

[cameel]

I see some of the external tests are still failing so that needs to be dealt with, but apart from that the changes seems fine and does not seem like anything is missing so approving already.

[cameel]

The failure in OpenZeppelin may require patching Hardhat settings to increase gas limit. Either for the transaction (gas) or the whole block (blockGasLimit).

Though it's odd that this is happening for the legacy-optimize-evm+yul preset. I'd assume that's their default target and prague does not really introduce anything that would affect gas usage compared to cancun.

[cameel]

Since OZ already has a fix, I think we could avoid patching it and instead switching to their master branch until the next release.

In any case, the current fix is still good enough for our purposes. It's late and we need this for tomorrow's release so if you don't want to fiddle with it any more, it's also fine to just merge it.

[cameel]

Could we just set ref to the master branch with the fix instead?

[matheusaaguiar]

I tried that, but then I get dependency errors about mismatched versions required

npm ERR! While resolving: @nomicfoundation/hardhat-chai-matchers@2.0.8
npm ERR! Found: ethers@6.13.6-beta.1
npm ERR! node_modules/ethers
npm ERR!   dev ethers@"6.13.6-beta.1" from the root project
npm ERR! 
npm ERR! Could not resolve dependency:
npm ERR! peer ethers@"^6.1.0" from @nomicfoundation/hardhat-chai-matchers@2.0.8
npm ERR! node_modules/@nomicfoundation/hardhat-chai-matchers
npm ERR!   dev @nomicfoundation/hardhat-chai-matchers@"^2.0.6" from the root project
npm ERR! 
npm ERR! Conflicting peer dependency: ethers@6.13.7
npm ERR! node_modules/ethers
npm ERR!   peer ethers@"^6.1.0" from @nomicfoundation/hardhat-chai-matchers@2.0.8
npm ERR!   node_modules/@nomicfoundation/hardhat-chai-matchers
npm ERR!     dev @nomicfoundation/hardhat-chai-matchers@"^2.0.6" from the root project