Bump rubocop-performance from 1.14.3 to 1.15.0 (#1836)

Bumps [rubocop-performance](https://github.com/rubocop/rubocop-performance) from 1.14.3 to 1.15.0.
- [Release notes](https://github.com/rubocop/rubocop-performance/releases)
- [Changelog](https://github.com/rubocop/rubocop-performance/blob/master/CHANGELOG.md)
- [Commits](rubocop/rubocop-performance@v1.14.3...v1.15.0)

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

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

Gemfile.lock

@@ -263,7 +263,7 @@ GEM
       unicode-display_width (>= 1.4.0, < 3.0)
     rubocop-ast (1.21.0)
       parser (>= 3.1.1.0)
-    rubocop-performance (1.14.3)
+    rubocop-performance (1.15.0)
       rubocop (>= 1.7.0, < 2.0)
       rubocop-ast (>= 0.4.0)
     rubocop-rails (2.15.2)