Bump secp256k1 from 0.24.0 to 0.24.2 (paritytech#1973)

Bumps [secp256k1](https://github.com/rust-bitcoin/rust-secp256k1) from 0.24.0 to 0.24.2.
- [Release notes](https://github.com/rust-bitcoin/rust-secp256k1/releases)
- [Changelog](https://github.com/rust-bitcoin/rust-secp256k1/blob/secp256k1-0.24.2/CHANGELOG.md)
- [Commits](rust-bitcoin/rust-secp256k1@secp256k1-0.24.0...secp256k1-0.24.2)

---
updated-dependencies:
- dependency-name: secp256k1
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <[email protected]>

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>