chore(deps): bump secp256k1 in /staking-miner-playground (#470)

Bumps [secp256k1](https://github.com/rust-bitcoin/rust-secp256k1) from 0.24.1 to 0.24.3.
- [Release notes](https://github.com/rust-bitcoin/rust-secp256k1/releases)
- [Changelog](https://github.com/rust-bitcoin/rust-secp256k1/blob/master/CHANGELOG.md)
- [Commits](rust-bitcoin/rust-secp256k1@secp256k1-0.24.1...secp256k1-0.24.3)

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

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Author: dependabot[bot]