Bump rubocop-rspec from 1.38.1 to 1.39.0

Bumps [rubocop-rspec](https://github.com/rubocop-hq/rubocop-rspec) from 1.38.1 to 1.39.0.
- [Release notes](https://github.com/rubocop-hq/rubocop-rspec/releases)
- [Changelog](https://github.com/rubocop-hq/rubocop-rspec/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rubocop-hq/rubocop-rspec/compare/v1.38.1...v1.39.0)

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

Gemfile.lock

@@ -214,7 +214,7 @@ GEM
     pagedown-bootstrap-rails (2.1.4)
       railties (> 3.1)
     parallel (1.19.1)
-    parser (2.7.0.4)
+    parser (2.7.1.2)
       ast (~> 2.4.0)
     path_expander (1.1.0)
     pg (1.2.3)
@@ -324,7 +324,7 @@ GEM
       rexml
       ruby-progressbar (~> 1.7)
       unicode-display_width (>= 1.4.0, < 1.7)
-    rubocop-rspec (1.38.1)
+    rubocop-rspec (1.39.0)
       rubocop (>= 0.68.1)
     ruby-progressbar (1.10.1)
     ruby-vips (2.0.17)