Update secp256k1 requirement from 0.20 to 0.23

[dependabot]

Updates the requirements on secp256k1 to permit the latest version.

Changelog

Sourced from secp256k1's changelog.

0.23.0 - 2022-06-21

The major change in this version is the increase of the Minimum Supported Rust Version (MSRV) from 1.29 to 1.41.1, this is a big change because it introduces Rust Edition 2018 to the codebase along with all the benefits that brings.

Breaking changes

• MSRV bumped to 1.41.1 and edition changed to 2018
• serde implements serialize fixed-width arrays as tuples in binary formats to avoid encoding the length
• Key tweaking methods renamed and refactored to use a more functional-style, they now accept a new Scalar type instead of raw slices
• Update rand dependency to 0.8
• KeyPair::from_secret_key borrows SecretKey instead of taking ownership
• SerializedSignature no longer implements Default

New features/APIs

• Several convenience/conversion methods between keys
• sign_ecdsa_with_noncedata and sign_ecdsa_recoverable_with_noncedata can be used to add additional entropy to ECDSA signatures
• Errors now display their sources if std is unavailable, with std they rely on the consumer to use the source() method
• Implemented TryFrom for Parity
• The alloc feature can be used on targets with allocators without a standard library
• SharedSecret can be created from a slice, parsed from a hex string, or (de)serialized using serde
• SerializedSignature implements IntoIterator (both owned and shared reference)
• We now derive std::hash::Hash for Signature

Other improvements

• global-context feature now activates global-context-less-secure.
• githooks/ directory added for contributors
• Clippy is now used in CI and the code is clippy-compliant
• Various documentation improvements
• Various CI/development improvements
• Various code quality improvements/refactors

0.22.1 - 2022-03-10

• Reintroduce accidentally removed possibility to create SharedSecret from byte serialization

0.22.0 - 2022-03-08

• Disable bitcoin_hashes/std by default; add bitcoin-hashes-std feature to re-enable it
• Rename more schnorrsig methods to schnorr
• Obfuscate SharedSecret string serialization
• Simplify SharedSecret API to use a 32-byte buffer; users of custom hashes should now use bare arrays rather than this type.
• Change serde serialization of Parity from i32 to u8; clean up error handling

0.21.3 - 2022-01-31

• Several documentation improvements (#366, #365, #373, #381, #369, #389, #391, #397, #399, #340)
• Deprecate the generate_schnorrsig_keypair method (unclear value)

... (truncated)

Commits

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[dependabot]

Superseded by #24.