Bump rubocop-shopify from 2.14.0 to 2.15.1

Bumps [rubocop-shopify](https://github.com/Shopify/ruby-style-guide) from 2.14.0 to 2.15.1.
- [Release notes](https://github.com/Shopify/ruby-style-guide/releases)
- [Commits](Shopify/ruby-style-guide@v2.14.0...v2.15.1)

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

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

Gemfile.lock

@@ -55,7 +55,7 @@ GEM
       parser (>= 3.2.1.0)
     rubocop-rake (0.6.0)
       rubocop (~> 1.0)
-    rubocop-shopify (2.14.0)
+    rubocop-shopify (2.15.1)
       rubocop (~> 1.51)
     rubocop-sorbet (0.7.7)
       rubocop (>= 0.90.0)