Bump retry-axios from 2.4.0 to 2.6.0
Bump retry-axios from 2.4.0 to 2.6.0

Bumps [retry-axios](https://github.com/JustinBeckwith/retry-axios) from 2.4.0 to 2.6.0.
- [Release notes](https://github.com/JustinBeckwith/retry-axios/releases)
- [Commits](https://github.com/JustinBeckwith/retry-axios/compare/v2.4.0...v2.6.0)

---
updated-dependencies:
- dependency-name: retry-axios
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
cloudant/couchbackup,cloudant/couchbackup