chore(deps): update rust crate secp256k1 to 0.30

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
secp256k1	dependencies	minor	0.29 -> 0.30

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Release Notes

rust-bitcoin/rust-secp256k1 (secp256k1)

v0.30.0

• Allow signing variable-length messages #​706
• Bump MSRV to 1.63 #​709
• Deprecate Message::from_digest_slice in favor of Message::from_digest #​712
• Truncate debug output of SecretKey; tighten bitcoin_hashes dependency version #​722
• Simplify and improve consistency of secret key types' debug output #​726
• Simplify and improve consistency of public key types' debug output #​745
• Feature-gate KeyPair::from_str on global-context or alloc #​728
• Add infallible constructors for schnorr::Signature from byteslices #​730
• Deprecate slice-parsing methods in favor of array-parsing ones #​737
• Make RecoveryId an enum rather than integer #​743

v0.29.1

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