Bump shoulda-matchers from 4.5.0 to 4.5.1 (#532)

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](thoughtbot/shoulda-matchers@v4.5.0...v4.5.1)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Author: dependabot-preview[bot]

Gemfile.lock

@@ -117,7 +117,7 @@ GEM
       launchy
     childprocess (3.0.0)
     coderay (1.1.3)
-    concurrent-ruby (1.1.7)
+    concurrent-ruby (1.1.8)
     crack (0.4.4)
     crass (1.0.6)
     debug_inspector (1.0.0)
@@ -364,7 +364,7 @@ GEM
       childprocess (>= 0.5, < 4.0)
       rubyzip (>= 1.2.2)
     shellany (0.0.1)
-    shoulda-matchers (4.5.0)
+    shoulda-matchers (4.5.1)
       activesupport (>= 4.2.0)
     simple_form (5.0.3)
       actionpack (>= 5.0)