Bump capistrano-bundler from 1.3.0 to 1.6.0 (#13416)

Bumps [capistrano-bundler](https://github.com/capistrano/bundler) from 1.3.0 to 1.6.0.
- [Release notes](https://github.com/capistrano/bundler/releases)
- [Changelog](https://github.com/capistrano/bundler/blob/master/CHANGELOG.md)
- [Commits](https://github.com/capistrano/bundler/compare/v1.3.0...v1.6.0)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Gemfile.lock

@@ -133,9 +133,8 @@ GEM
       i18n
       rake (>= 10.0.0)
       sshkit (>= 1.9.0)
-    capistrano-bundler (1.3.0)
+    capistrano-bundler (1.6.0)
       capistrano (~> 3.1)
-      sshkit (~> 1.2)
     capistrano-rails (1.4.0)
       capistrano (~> 3.1)
       capistrano-bundler (~> 1.1)