Bump _data/popolo-data from 496f188 to 857b5dd

Bumps [_data/popolo-data](https://github.com/SomethingNewUK/popolo-data) from `496f188` to `857b5dd`.
- [Commits](SomethingNewUK/popolo-data@496f188...857b5dd)

---
updated-dependencies:
- dependency-name: _data/popolo-data
  dependency-type: direct:production
...

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