Bump ransack from 2.5.0 to 2.6.0

Bumps [ransack](https://github.com/activerecord-hackery/ransack) from 2.5.0 to 2.6.0.
- [Release notes](https://github.com/activerecord-hackery/ransack/releases)
- [Changelog](https://github.com/activerecord-hackery/ransack/blob/master/CHANGELOG.md)
- [Commits](https://github.com/activerecord-hackery/ransack/compare/v2.5.0...v2.6.0)

---
updated-dependencies:
- dependency-name: ransack
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Gemfile.lock

@@ -368,9 +368,9 @@ GEM
       thor (~> 1.0)
     rainbow (3.1.1)
     rake (13.0.6)
-    ransack (2.5.0)
+    ransack (2.6.0)
-      activerecord (>= 5.2.4)
+      activerecord (>= 6.0.4)
-      activesupport (>= 5.2.4)
+      activesupport (>= 6.0.4)
       i18n
     rb-fsevent (0.11.1)
     rb-inotify (0.10.1)