build(deps): bump solana-epoch-rewards from 3.0.2 to 3.1.0 (#444)

Bumps [solana-epoch-rewards](https://github.com/anza-xyz/solana-sdk) from 3.0.2 to 3.1.0.
- [Release notes](https://github.com/anza-xyz/solana-sdk/releases)
- [Commits](https://github.com/anza-xyz/solana-sdk/compare/borsh@v3.0.2...msg@v3.1.0)

---
updated-dependencies:
- dependency-name: solana-epoch-rewards
  dependency-version: 3.1.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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