Bump _data/popolo-data from 3ab3108 to 8a3ba8c

Bumps [_data/popolo-data](https://github.com/SomethingNewUK/popolo-data) from `3ab3108` to `8a3ba8c`.
- [Commits](SomethingNewUK/popolo-data@3ab3108...8a3ba8c)

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

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