Update secp256k1 requirement from 0.27 to 0.28

[dependabot[bot]]

Updates the requirements on secp256k1 to permit the latest version.

Changelog

Sourced from secp256k1's changelog.

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.

0.26.0 - 2202-12-19

• Update libsecp25k1 to v0.2.0

0.25.0 - 2022-12-07

• Fix soundness issue with preallocated_gen_new
• Update to secp256k1-sys v0.7.0
• Use type system to improve safety.
• Change secp256k1-sys symbol names to 0_6_1.
• Introduce rustfmt to the codebase.
• Make all raw pointer methods go through the CPtr trait.
• Make comparison functions stable.
• Remove public constant ONE_KEY (consider using FromStr as a replacement).

0.24.1 - 2022-10-25

• Fix broken deserialization logic of KeyPair that previously always panicked. After the patch deserialization only panics if neither the global-context nor the alloc (default) feature is active.

0.24.0 - 2022-07-20

• Upgrade to new release of bitcoin_hashes.

0.23.4 - 2022-07-14

• Disable automatic rerandomization of contexts under WASM

0.23.3 - 2022-06-29

• Add must_use for mut self key manipulation methods
• Fix fuzzing feature guard

0.23.2 - 2022-06-27

... (truncated)

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