Bump rspec-rails from 5.1.1 to 5.1.2 in /src/supermarket (#2702)

Bumps [rspec-rails](https://github.com/rspec/rspec-rails) from 5.1.1 to 5.1.2.
- [Release notes](https://github.com/rspec/rspec-rails/releases)
- [Changelog](https://github.com/rspec/rspec-rails/blob/main/Changelog.md)
- [Commits](rspec/rspec-rails@v5.1.1...v5.1.2)

---
updated-dependencies:
- dependency-name: rspec-rails
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

src/supermarket/Gemfile.lock

@@ -395,7 +395,7 @@ GEM
     logging (2.3.0)
       little-plugger (~> 1.1)
       multi_json (~> 1.14)
-    loofah (2.15.0)
+    loofah (2.16.0)
       crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
     lumberjack (1.2.8)
@@ -600,10 +600,10 @@ GEM
     rspec-its (1.3.0)
       rspec-core (>= 3.0.0)
       rspec-expectations (>= 3.0.0)
-    rspec-mocks (3.11.0)
+    rspec-mocks (3.11.1)
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.11.0)
-    rspec-rails (5.1.1)
+    rspec-rails (5.1.2)
       actionpack (>= 5.2)
       activesupport (>= 5.2)
       railties (>= 5.2)