Bump rubocop-sorbet from 0.8.6 to 0.8.7 (#565)

Bumps [rubocop-sorbet](https://github.com/shopify/rubocop-sorbet) from 0.8.6 to 0.8.7.
- [Release notes](https://github.com/shopify/rubocop-sorbet/releases)
- [Commits](Shopify/rubocop-sorbet@v0.8.6...v0.8.7)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Gemfile.lock

@@ -214,7 +214,7 @@ GEM
       rubocop (~> 1.61)
     rubocop-sequel (0.3.7)
       rubocop (~> 1.0)
-    rubocop-sorbet (0.8.6)
+    rubocop-sorbet (0.8.7)
       rubocop (>= 1)
     rubocop-thread_safety (0.6.0)
       rubocop (>= 1.48.1)