Bump sp-staking from polkadot-v1.16.5 to polkadot-v1.17.3

Bumps [sp-staking](https://github.com/paritytech/polkadot-sdk) from polkadot-v1.16.5 to polkadot-v1.17.3.
- [Release notes](https://github.com/paritytech/polkadot-sdk/releases)
- [Changelog](https://github.com/paritytech/polkadot-sdk/blob/master/docs/RELEASE.md)
- [Commits](paritytech/polkadot-sdk@ac431bc...06158dd)

---
updated-dependencies:
- dependency-name: sp-staking
  dependency-type: direct:production
...

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

Author: dependabot[bot]