Update secp256k1 requirement from 0.23.0 to 0.31.1

[dependabot]

Updates the requirements on secp256k1 to permit the latest version.

Changelog

Sourced from secp256k1's changelog.

0.29.1 - 2024-09-06

• Deprecate hashes reexport

  Because the reexport can have any of the incompatible versions using it is prone to breakage. The bitcoin_hashes crate is not used in our API anyway, so you should just depend on it yourself using a version range that's appropriate for your crate.

• Fix version range of the bitcoin_hashes crate.

0.29.0 - 2024-04-02

• Deprecate ThirtyTwoByteHash #686

  This trait turned out to be problematic during upgrade because we support a ranged dependency for bitcoin_hashes. Consider implementing From<T> for Message for your type iff your type is a 32 byte hash (ie, output from a hash algorithm that produces a 32 byte digest like sha256). When using the impl, consider using Message::from instead of hash.into() because we will be introducing generics in a future version and the compiler will not be able to work out the target type.

• Bump MSRV to Rust v1.56.1 #693

• Upgrade hashes using range dependency version = ">= 0.12, <= 0.14" #690

• Depend on latest secp256k1-sys (vendors secp256k1 v0.4.1) #688

0.28.2 - 2024-01-30

• Implement Hash for Scalar #674
• Implement Ord and PartialOrd for RecoverableSignature #611
• Add byte accessors to ElligatorSwiftSharedSecret #676

0.28.1 - 2024-01-03

• Update secp265k1-sys to 0.9.2 (contains some fixes for WASM and a FFI binding fix)
• Various improvements to the SerializedSignature type #658 #659

0.28.0 - 2023-10-23

• Add bindings to the ElligatorSwift implementation #627
• Depend on recent release of bitcoin_hashes v0.13.0 #621
• Add a verify function to PublicKey #618
• Add serialize function for schnorr::Signature #607
• Bump MSRV to 1.48 #595
• Remove implementations of PartialEq, Eq, PartialOrd, Ord, and Hash from the impl_array_newtype macro. Users will now need to derive these traits if they are wanted.

0.27.0 - 2023-03-15

• Depend on newly release bitcoin_hashes v0.12.
• Implement Debug trait for Scalar type.
• Implement insecure-erase.

... (truncated)

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