Bump rspec-rails from 5.0.2 to 5.1.0

Bumps [rspec-rails](https://github.com/rspec/rspec-rails) from 5.0.2 to 5.1.0.
- [Release notes](https://github.com/rspec/rspec-rails/releases)
- [Changelog](https://github.com/rspec/rspec-rails/blob/main/Changelog.md)
- [Commits](https://github.com/rspec/rspec-rails/compare/v5.0.2...v5.1.0)

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

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

Gemfile.lock

@@ -98,7 +98,7 @@ GEM
     ffi (1.15.5)
     globalid (1.0.0)
       activesupport (>= 5.0)
-    i18n (1.8.11)
+    i18n (1.9.0)
       concurrent-ruby (~> 1.0)
     image_processing (1.12.1)
       mini_magick (>= 4.9.5, < 5)
@@ -201,7 +201,7 @@ GEM
     rspec-mocks (3.10.2)
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.10.0)
-    rspec-rails (5.0.2)
+    rspec-rails (5.1.0)
       actionpack (>= 5.2)
       activesupport (>= 5.2)
       railties (>= 5.2)