Update dependency spring to v4.2.0 (#154)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [spring](https://togithub.com/rails/spring) | `4.1.3` -> `4.2.0` |
[![age](https://developer.mend.io/api/mc/badges/age/rubygems/spring/4.2.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
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|
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|
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|

---

### Release Notes

<details>
<summary>rails/spring (spring)</summary>

###
[`v4.2.0`](https://togithub.com/rails/spring/blob/HEAD/CHANGELOG.md#420)

[Compare
Source](https://togithub.com/rails/spring/compare/v4.1.3...v4.2.0)

- Added `Spring.reset_on_env` to define environment variables which
should cause spring to reload when they change.
- Added `Spring.spawn_on_en` to define environment variables that should
cause spring to start a distinct server.
-   Better handle a case where the server could hang.

</details>

---

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Gemfile.lock

@@ -236,7 +236,7 @@ GEM
       simplecov_json_formatter (~> 0.1)
     simplecov-html (0.12.3)
     simplecov_json_formatter (0.1.4)
-    spring (4.1.3)
+    spring (4.2.0)
     spring-commands-rspec (1.0.4)
       spring (>= 0.9.1)
     spring-watcher-listen (2.1.0)