chore(deps): bump polkadot-sdk from 62f2553 to b2bcb74 (#1207)

Bumps [polkadot-sdk](https://github.com/paritytech/polkadot-sdk) from `62f2553` to `b2bcb74`.
- [Release notes](https://github.com/paritytech/polkadot-sdk/releases)
- [Commits](paritytech/polkadot-sdk@62f2553...b2bcb74)

---
updated-dependencies:
- dependency-name: polkadot-sdk
  dependency-version: b2bcb74b13f1a1e082f701e3e05ce1be44d16790
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]