Build(deps): Bump in_threads from 1.5.4 to 1.6.0 (#15642)

Bumps [in_threads](https://github.com/toy/in_threads) from 1.5.4 to 1.6.0.
- [Release notes](https://github.com/toy/in_threads/releases)
- [Changelog](https://github.com/toy/in_threads/blob/master/CHANGELOG.markdown)
- [Commits](https://github.com/toy/in_threads/compare/v1.5.4...v1.6.0)

---
updated-dependencies:
- dependency-name: in_threads
  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>

Gemfile.lock

@@ -184,7 +184,7 @@ GEM
       in_threads (~> 1.3)
       progress (~> 3.0, >= 3.0.1)
     image_size (3.0.1)
-    in_threads (1.5.4)
+    in_threads (1.6.0)
     ipaddr (1.2.4)
     jmespath (1.5.0)
     jquery-rails (4.4.0)