Bump rubocop-performance from 1.8.1 to 1.9.0

Bumps [rubocop-performance](https://github.com/rubocop-hq/rubocop-performance) from 1.8.1 to 1.9.0.
- [Release notes](https://github.com/rubocop-hq/rubocop-performance/releases)
- [Changelog](https://github.com/rubocop-hq/rubocop-performance/blob/master/CHANGELOG.md)
- [Commits](rubocop/rubocop-performance@v1.8.1...v1.9.0)

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

Gemfile.lock

@@ -68,8 +68,8 @@ GEM
       unicode-display_width (>= 1.4.0, < 2.0)
     rubocop-ast (1.1.1)
       parser (>= 2.7.1.5)
-    rubocop-performance (1.8.1)
-      rubocop (>= 0.87.0)
+    rubocop-performance (1.9.0)
+      rubocop (>= 0.90.0, < 2.0)
       rubocop-ast (>= 0.4.0)
     rubocop-rspec (2.0.0)
       rubocop (~> 1.0)