build(deps): bump retriable from 3.5.1 to 3.8.0 (cloudfoundry#5133)

Bumps [retriable](https://github.com/kamui/retriable) from 3.5.1 to 3.8.0.
- [Release notes](https://github.com/kamui/retriable/releases)
- [Changelog](https://github.com/kamui/retriable/blob/3.8.x/CHANGELOG.md)
- [Commits](kamui/retriable@v3.5.1...v3.8.0)

---
updated-dependencies:
- dependency-name: retriable
  dependency-version: 3.8.0
  dependency-type: indirect
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

Gemfile.lock

@@ -423,7 +423,7 @@ GEM
       http-cookie (>= 1.0.2, < 2.0)
       mime-types (>= 1.16, < 4.0)
       netrc (~> 0.8)
-    retriable (3.5.1)
+    retriable (3.8.0)
     reverse_markdown (3.0.2)
       nokogiri
     rexml (3.4.4)