Bump rubocop-rails from 2.4.1 to 2.5.2

Bumps [rubocop-rails](https://github.com/rubocop-hq/rubocop-rails) from 2.4.1 to 2.5.2.
- [Release notes](https://github.com/rubocop-hq/rubocop-rails/releases)
- [Changelog](https://github.com/rubocop-hq/rubocop-rails/blob/master/CHANGELOG.md)
- [Commits](rubocop/rubocop-rails@v2.4.1...v2.5.2)

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

Gemfile.lock

@@ -120,7 +120,7 @@ GEM
     nokogiri (1.10.9)
       mini_portile2 (~> 2.4.0)
     parallel (1.19.1)
-    parser (2.7.0.3)
+    parser (2.7.1.0)
       ast (~> 2.4.0)
     pi_piper (2.0.0)
       eventmachine (= 1.0.9)
@@ -192,7 +192,8 @@ GEM
       rexml
       ruby-progressbar (~> 1.7)
       unicode-display_width (>= 1.4.0, < 1.7)
-    rubocop-rails (2.4.1)
+    rubocop-rails (2.5.2)
+      activesupport
       rack (>= 1.1)
       rubocop (>= 0.72.0)
     ruby-progressbar (1.10.1)