Bump rubocop-performance from 1.15.0 to 1.15.1 in /dependencies

Bumps [rubocop-performance](https://github.com/rubocop/rubocop-performance) from 1.15.0 to 1.15.1.
- [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/v1.15.0...v1.15.1)

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

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

dependencies/Gemfile

@@ -7,7 +7,7 @@ git_source(:github) { |repo_name| "https://github.com/#{repo_name}" }
 gem "rubocop", "~> 1.41.0"
 gem "rubocop-github", "~> 0.18.0"
 gem "rubocop-minitest", "~> 0.22.2"
-gem "rubocop-performance", "~>1.15.0"
+gem "rubocop-performance", "~>1.15.1"
 gem "rubocop-rails", "~> 2.16"
 gem "rubocop-rake", "~> 0.6.0"
 gem "rubocop-rspec", "~> 2.16.0"

dependencies/Gemfile.lock

@@ -37,7 +37,7 @@ GEM
       rubocop-rails
     rubocop-minitest (0.22.2)
       rubocop (>= 0.90, < 2.0)
-    rubocop-performance (1.15.0)
+    rubocop-performance (1.15.1)
       rubocop (>= 1.7.0, < 2.0)
       rubocop-ast (>= 0.4.0)
     rubocop-rails (2.16.1)
@@ -60,7 +60,7 @@ DEPENDENCIES
   rubocop (~> 1.41.0)
   rubocop-github (~> 0.18.0)
   rubocop-minitest (~> 0.22.2)
-  rubocop-performance (~> 1.15.0)
+  rubocop-performance (~> 1.15.1)
   rubocop-rails (~> 2.16)
   rubocop-rake (~> 0.6.0)
   rubocop-rspec (~> 2.16.0)