Bump fink-client from 8.7 to 8.8

Bumps [fink-client](https://github.com/astrolabsoftware/fink-client) from 8.7 to 8.8.
- [Release notes](https://github.com/astrolabsoftware/fink-client/releases)
- [Commits](astrolabsoftware/fink-client@8.7...8.8)

---
updated-dependencies:
- dependency-name: fink-client
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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