Bump csv from 5.1.1 to 6.0.0

Bumps [csv](https://github.com/close2/csv) from 5.1.1 to 6.0.0.
- [Changelog](https://github.com/close2/csv/blob/master/CHANGELOG.md)
- [Commits](https://github.com/close2/csv/commits)

---
updated-dependencies:
- dependency-name: csv
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

pubspec.yaml

@@ -26,6 +26,6 @@ dev_dependencies:
 dependencies:
   args: ^2.4.0
   country_code: ^1.0.0
-  csv: ^5.0.1
+  csv: ^6.0.0
   intl: ^0.18.0
   logging: ^1.1.1