Maintenance: Bump spring from 3.1.1 to 4.0.0

Bumps [spring](https://github.com/rails/spring) from 3.1.1 to 4.0.0.
- [Release notes](https://github.com/rails/spring/releases)
- [Changelog](https://github.com/rails/spring/blob/main/CHANGELOG.md)
- [Commits](https://github.com/rails/spring/compare/v3.1.1...v4.0.0)

Gemfile.lock

@@ -574,7 +574,7 @@ GEM
       hashie
       websocket-driver
     slop (3.6.0)
-    spring (3.1.1)
+    spring (4.0.0)
     spring-commands-rspec (1.0.4)
       spring (>= 0.9.1)
     spring-commands-testunit (1.0.1)