Bump rubocop-performance from 1.21.0 to 1.21.1

Bumps [rubocop-performance](https://github.com/rubocop/rubocop-performance) from 1.21.0 to 1.21.1.
- [Release notes](https://github.com/rubocop/rubocop-performance/releases)
- [Changelog](https://github.com/rubocop/rubocop-performance/blob/master/CHANGELOG.md)
- [Commits](rubocop/rubocop-performance@v1.21.0...v1.21.1)

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

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

Gemfile.lock

@@ -79,7 +79,7 @@ GEM
     minitest (5.23.1)
     mutex_m (0.2.0)
     parallel (1.25.1)
-    parser (3.3.2.0)
+    parser (3.3.3.0)
       ast (~> 2.4.1)
       racc
     psych (5.1.2)
@@ -92,7 +92,7 @@ GEM
     regexp_parser (2.9.2)
     reline (0.5.0)
       io-console (~> 0.5)
-    rexml (3.2.9)
+    rexml (3.3.0)
       strscan
     rspec (3.13.0)
       rspec-core (~> 3.13.0)
@@ -124,7 +124,7 @@ GEM
       rubocop (~> 1.41)
     rubocop-factory_bot (2.26.0)
       rubocop (~> 1.41)
-    rubocop-performance (1.21.0)
+    rubocop-performance (1.21.1)
       rubocop (>= 1.48.1, < 2.0)
       rubocop-ast (>= 1.31.1, < 2.0)
     rubocop-rake (0.6.0)