deps: update dependency jeepney to v0.8.0 (#788)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [jeepney](https://gitlab.com/takluyver/jeepney) | `==0.7.1` -> `==0.8.0` | [![age](https://badges.renovateapi.com/packages/pypi/jeepney/0.8.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/pypi/jeepney/0.8.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/pypi/jeepney/0.8.0/compatibility-slim/0.7.1)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/pypi/jeepney/0.8.0/confidence-slim/0.7.1)](https://docs.renovatebot.com/merge-confidence/) |

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