Bump sp-consensus-grandpa

Bumps [sp-consensus-grandpa](https://github.com/humanode-network/substrate) from locked/polkadot-v0.9.40-2024-08-02 to locked/polkadot-v0.9.40-2024.06.26.
- [Changelog](https://github.com/humanode-network/substrate/blob/master/docs/CHANGELOG.md)
- [Commits](humanode-network/substrate@fc5aabd...c8c9722)

---
updated-dependencies:
- dependency-name: sp-consensus-grandpa
  dependency-type: direct:production
...

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