Bump rubocop-performance from 1.20.2 to 1.21.1

Bumps [rubocop-performance](https://github.com/rubocop/rubocop-performance) from 1.20.2 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@v1.20.2...v1.21.1)

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

Signed-off-by: dependabot[bot] <[email protected]>

Gemfile.lock

@@ -308,8 +308,8 @@ GEM
       racc (~> 1.4)
     orm_adapter (0.5.0)
     pagy (8.4.5)
-    parallel (1.24.0)
-    parser (3.3.0.5)
+    parallel (1.25.1)
+    parser (3.3.4.0)
       ast (~> 2.4.1)
       racc
     pg (1.5.4)
@@ -370,12 +370,12 @@ GEM
     rb-inotify (0.10.1)
       ffi (~> 1.0)
     redcarpet (3.6.0)
-    regexp_parser (2.9.0)
+    regexp_parser (2.9.2)
     responders (3.1.1)
       actionpack (>= 5.2)
       railties (>= 5.2)
-    rexml (3.2.8)
-      strscan (>= 3.0.9)
+    rexml (3.3.1)
+      strscan
     rladr (1.2.0)
     rouge (4.2.0)
     rspec (3.10.0)
@@ -422,9 +422,9 @@ GEM
       rubocop-rails (= 2.24.1)
       rubocop-rake (= 0.6.0)
       rubocop-rspec (= 2.28.0)
-    rubocop-performance (1.20.2)
+    rubocop-performance (1.21.1)
       rubocop (>= 1.48.1, < 2.0)
-      rubocop-ast (>= 1.30.0, < 2.0)
+      rubocop-ast (>= 1.31.1, < 2.0)
     rubocop-rails (2.24.1)
       activesupport (>= 4.2.0)
       rack (>= 1.1)