Future curve library updates will break nightly CI

[AaronFeickert]

This is a tracking issue to note that any updates of the curve library fork to upstream version 4.1.2 or later will break on the current nightly toolchain.

The current version of the curve library used for the fork breaks nightly CI starting with the nightly-2024-02-05 toolchain. A recent upstream PR fixes this, but is not backwards compatible.

This means that if the curve library fork is ever updated to include the fix, it will break this repository's nightly CI. The ecosystem's repositories will need to move to stable or at least nightly-2024-02-05 if this happens.