Bump rubocop-rails from 2.12.4 to 2.13.2

Bumps [rubocop-rails](https://github.com/rubocop/rubocop-rails) from 2.12.4 to 2.13.2.
- [Release notes](https://github.com/rubocop/rubocop-rails/releases)
- [Changelog](https://github.com/rubocop/rubocop-rails/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rubocop/rubocop-rails/compare/v2.12.4...v2.13.2)

---
updated-dependencies:
- dependency-name: rubocop-rails
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Gemfile.lock

@@ -398,7 +398,7 @@ GEM
     parallel (1.21.0)
     paranoia (2.4.3)
       activerecord (>= 4.0, < 6.2)
-    parser (3.0.2.0)
+    parser (3.1.0.0)
       ast (~> 2.4.1)
     paypal-sdk-core (0.3.4)
       multi_json (~> 1.0)
@@ -471,7 +471,7 @@ GEM
       method_source
       rake (>= 0.13)
       thor (~> 1.0)
-    rainbow (3.0.0)
+    rainbow (3.1.1)
     rake (13.0.6)
     ransack (2.4.2)
       activerecord (>= 5.2.4)
@@ -482,7 +482,7 @@ GEM
       ffi (~> 1.0)
     redcarpet (3.5.1)
     redis (4.5.1)
-    regexp_parser (2.1.1)
+    regexp_parser (2.2.0)
     request_store (1.5.0)
       rack (>= 1.4)
     responders (3.0.1)
@@ -547,9 +547,9 @@ GEM
       rubocop-ast (>= 1.12.0, < 2.0)
       ruby-progressbar (~> 1.7)
       unicode-display_width (>= 1.4.0, < 3.0)
-    rubocop-ast (1.12.0)
+    rubocop-ast (1.15.1)
       parser (>= 3.0.1.1)
-    rubocop-rails (2.12.4)
+    rubocop-rails (2.13.2)
       activesupport (>= 4.2.0)
       rack (>= 1.1)
       rubocop (>= 1.7.0, < 2.0)