build(deps-dev): bump sorbet-runtime from 0.6.13403 to 0.6.13421

Bumps [sorbet-runtime](https://github.com/sorbet/sorbet) from 0.6.13403 to 0.6.13421.
- [Release notes](https://github.com/sorbet/sorbet/releases)
- [Commits](https://github.com/sorbet/sorbet/commits)

---
updated-dependencies:
- dependency-name: sorbet-runtime
  dependency-version: 0.6.13421
  dependency-type: indirect
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

Gemfile.lock

@@ -390,7 +390,7 @@ GEM
       yard (~> 0.9, >= 0.9.24)
       yard-activesupport-concern (~> 0.0)
       yard-solargraph (~> 0.1)
-    sorbet-runtime (0.6.13403)
+    sorbet-runtime (0.6.13421)
     sord (7.1.0)
       commander (~> 5.0)
       parlour (~> 9.1)