Bump rubocop-performance from 1.15.0 to 1.15.1

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:development
  update-type: version-update:semver-patch
...

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

Gemfile.lock

@@ -374,7 +374,7 @@ GEM
     rb-inotify (0.10.1)
       ffi (~> 1.0)
     rbtree (0.4.5)
-    regexp_parser (2.6.0)
+    regexp_parser (2.6.1)
     remotipart (1.4.4)
     rest-client (2.1.0)
       http-accept (>= 1.7.0, < 2.0)
@@ -421,7 +421,7 @@ GEM
       unicode-display_width (>= 1.4.0, < 3.0)
     rubocop-ast (1.23.0)
       parser (>= 3.1.1.0)
-    rubocop-performance (1.15.0)
+    rubocop-performance (1.15.1)
       rubocop (>= 1.7.0, < 2.0)
       rubocop-ast (>= 0.4.0)
     rubocop-rails (2.17.2)