Bump shoulda-matchers from 4.5.0 to 4.5.1

Bumps [shoulda-matchers](https://github.com/thoughtbot/shoulda-matchers) from 4.5.0 to 4.5.1.
- [Release notes](https://github.com/thoughtbot/shoulda-matchers/releases)
- [Changelog](https://github.com/thoughtbot/shoulda-matchers/blob/master/CHANGELOG.md)
- [Commits](https://github.com/thoughtbot/shoulda-matchers/compare/v4.5.0...v4.5.1)

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

Gemfile.lock

@@ -312,7 +312,7 @@ GEM
       thor (>= 0.19.0, < 2.0)
     rainbow (3.0.0)
     rake (13.0.3)
-    ransack (2.4.1)
+    ransack (2.4.2)
       activerecord (>= 5.2.4)
       activesupport (>= 5.2.4)
       i18n
@@ -394,7 +394,7 @@ GEM
     semantic_range (2.3.1)
     sentry-raven (3.1.1)
       faraday (>= 1.0)
-    shoulda-matchers (4.5.0)
+    shoulda-matchers (4.5.1)
       activesupport (>= 4.2.0)
     simplecov (0.21.2)
       docile (~> 1.1)