Bump rubocop-performance from 1.12.0 to 1.13.1 (#2521)

Bumps [rubocop-performance](https://github.com/rubocop/rubocop-performance) from 1.12.0 to 1.13.1.
- [Release notes](https://github.com/rubocop/rubocop-performance/releases)
- [Changelog](https://github.com/rubocop/rubocop-performance/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rubocop/rubocop-performance/compare/v1.12.0...v1.13.1)

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

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Gemfile

@@ -38,7 +38,7 @@ gem 'therubyrhino', '>= 2.0', platforms: :jruby
 
 # Code Quality
 gem 'rubocop', '~> 1.24', require: false
-gem 'rubocop-performance', '~> 1.12', require: false
+gem 'rubocop-performance', '~> 1.13', require: false
 gem 'simplecov', '~> 0.21', require: false
 
 # Middleman itself

Gemfile.lock

@@ -163,7 +163,7 @@ GEM
       tilt (>= 1.4.1, < 3)
     padrino-support (0.14.4)
     parallel (1.21.0)
-    parser (3.0.3.2)
+    parser (3.1.0.0)
       ast (~> 2.4.1)
     parslet (1.8.2)
     protobuf-cucumber (3.10.8)
@@ -222,7 +222,7 @@ GEM
       unicode-display_width (>= 1.4.0, < 3.0)
     rubocop-ast (1.15.1)
       parser (>= 3.0.1.1)
-    rubocop-performance (1.12.0)
+    rubocop-performance (1.13.1)
       rubocop (>= 1.7.0, < 2.0)
       rubocop-ast (>= 0.4.0)
     ruby-progressbar (1.11.0)
@@ -292,7 +292,7 @@ DEPENDENCIES
   redcarpet (>= 3.1)
   rspec (~> 3.10)
   rubocop (~> 1.24)
-  rubocop-performance (~> 1.12)
+  rubocop-performance (~> 1.13)
   rubydns (~> 2.0.2)
   sassc (~> 2.4)
   simplecov (~> 0.21)