Update rubocop-shopify requirement from ~> 2.9.0 to ~> 2.15.1

Updates the requirements on [rubocop-shopify](https://github.com/Shopify/ruby-style-guide) to permit the latest version.
- [Release notes](https://github.com/Shopify/ruby-style-guide/releases)
- [Commits](Shopify/ruby-style-guide@v2.9.0...v2.15.1)

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

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

Gemfile

@@ -7,7 +7,7 @@ group :development do
   gem "rspec", require: false
   gem "rubocop", require: false
   gem "rubocop-rspec", require: false
-  gem "rubocop-shopify", "~> 2.9.0", require: false
+  gem "rubocop-shopify", "~> 2.15.1", require: false
   gem "sorbet", require: false
 end
 

Gemfile.lock

@@ -48,8 +48,8 @@ GEM
       parser (>= 3.3.1.0)
     rubocop-rspec (3.2.0)
       rubocop (~> 1.61)
-    rubocop-shopify (2.9.0)
-      rubocop (~> 1.33)
+    rubocop-shopify (2.15.1)
+      rubocop (~> 1.51)
     ruby-progressbar (1.13.0)
     sorbet (0.5.11631)
       sorbet-static (= 0.5.11631)
@@ -69,7 +69,7 @@ DEPENDENCIES
   rspec
   rubocop
   rubocop-rspec
-  rubocop-shopify (~> 2.9.0)
+  rubocop-shopify (~> 2.15.1)
   sorbet
 
 BUNDLED WITH