Bump spring from 3.0.0 to 3.1.1 in /src/supermarket

Bumps [spring](https://github.com/rails/spring) from 3.0.0 to 3.1.1.
- [Release notes](https://github.com/rails/spring/releases)
- [Changelog](https://github.com/rails/spring/blob/main/CHANGELOG.md)
- [Commits](rails/spring@v3.0.0...v3.1.1)

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

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

src/supermarket/Gemfile.lock

@@ -678,7 +678,7 @@ GEM
     simplecov_json_formatter (0.1.3)
     sitemap_generator (6.1.2)
       builder (~> 3.0)
-    spring (3.0.0)
+    spring (3.1.1)
     spring-commands-rspec (1.0.4)
       spring (>= 0.9.1)
     sprockets (4.0.2)