Bump rspec-openapi from 0.18.3 to 0.18.4 (#986)

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

Author: dependabot[bot]

Gemfile.lock

@@ -482,15 +482,15 @@ GEM
       railties (>= 5.2)
     rexml (3.4.1)
     rouge (4.3.0)
-    rspec-core (3.13.2)
+    rspec-core (3.13.3)
       rspec-support (~> 3.13.0)
     rspec-expectations (3.13.3)
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.13.0)
     rspec-mocks (3.13.2)
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.13.0)
-    rspec-openapi (0.18.3)
+    rspec-openapi (0.18.4)
       actionpack (>= 5.2.0)
       rails-dom-testing
       rspec-core