chore(deps): update resque requirement in /examples/using-resque

Updates the requirements on [resque](https://github.com/resque/resque) to permit the latest version.
- [Release notes](https://github.com/resque/resque/releases)
- [Changelog](https://github.com/resque/resque/blob/master/HISTORY.md)
- [Commits](resque/resque@v2.5.0...v2.6.0)

---
updated-dependencies:
- dependency-name: resque
  dependency-type: direct:production
...

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

Author: dependabot[bot]

examples/using-resque/Gemfile

@@ -1,5 +1,5 @@
 source "https://rubygems.org"
 
-gem "resque", "2.5.0"
+gem "resque", "2.6.0"
 
 gem "redis", "5.0.6"