Bump spring from 4.1.1 to 4.2.1

Bumps [spring](https://github.com/rails/spring) from 4.1.1 to 4.2.1.
- [Release notes](https://github.com/rails/spring/releases)
- [Changelog](https://github.com/rails/spring/blob/main/CHANGELOG.md)
- [Commits](rails/spring@v4.1.1...v4.2.1)

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

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

Gemfile.lock

@@ -493,7 +493,7 @@ GEM
     snaky_hash (2.0.1)
       hashie
       version_gem (~> 1.1, >= 1.1.1)
-    spring (4.1.1)
+    spring (4.2.1)
     spring-commands-rspec (1.0.4)
       spring (>= 0.9.1)
     sprockets (4.2.0)