Bump rubocop-performance from 1.6.1 to 1.7.0

Bumps [rubocop-performance](https://github.com/rubocop-hq/rubocop-performance) from 1.6.1 to 1.7.0.
- [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@v1.6.1...v1.7.0)

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

Gemfile.lock

@@ -399,8 +399,8 @@ GEM
       parser (>= 2.7.0.1)
     rubocop-minitest (0.9.0)
       rubocop (>= 0.74)
-    rubocop-performance (1.6.1)
-      rubocop (>= 0.71.0)
+    rubocop-performance (1.7.0)
+      rubocop (>= 0.82.0)
     rubocop-rails (2.6.0)
       activesupport (>= 4.2.0)
       rack (>= 1.1)