Port secp256k1 v0.3.2

[azuchi]

Port libsecp256k1 v0.3.2, which addresses the issue of optimizing the code for ECDH side-channel protection after GCC v13.

https://github.com/bitcoin-core/secp256k1/blob/master/CHANGELOG.md

[Naviabheeman]

I think the fix refers to this commit (bitcoin-core/secp256k1@a575339) But our library does not include commit 7c1b91b which introduced it.