Bump sp-keystore from 0.27.0 to 0.29.0

Bumps [sp-keystore](https://github.com/paritytech/polkadot-sdk) from 0.27.0 to 0.29.0.
- [Commits](https://github.com/paritytech/polkadot-sdk/commits)

---
updated-dependencies:
- dependency-name: sp-keystore
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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