build(deps): bump solana-pubkey from 4.2.0 to 4.2.1

Bumps [solana-pubkey](https://github.com/anza-xyz/solana-sdk) from 4.2.0 to 4.2.1.
- [Release notes](https://github.com/anza-xyz/solana-sdk/releases)
- [Commits](https://github.com/anza-xyz/solana-sdk/compare/hash@v4.2.0...rent@v4.2.1)

---
updated-dependencies:
- dependency-name: solana-pubkey
  dependency-version: 4.2.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]