Bump gearman-ruby from 3.0.7 to 4.0.5

Bumps [gearman-ruby](https://github.com/johnewart/gearman-ruby) from 3.0.7 to 4.0.5.
- [Changelog](https://github.com/johnewart/gearman-ruby/blob/master/CHANGELOG.md)
- [Commits](johnewart/gearman-ruby@v3.0.7...v4.0.5)

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

Signed-off-by: dependabot[bot] <support@github.com>

Gemfile.lock

@@ -2,7 +2,7 @@ GEM
   remote: https://rubygems.org/
   specs:
     connection_pool (2.4.1)
-    gearman-ruby (3.0.7)
+    gearman-ruby (4.0.5)
     redis (5.2.0)
       redis-client (>= 0.22.0)
     redis-client (0.22.2)