Bump rspec-core from 3.9.0 to 3.9.1

Bumps [rspec-core](https://github.com/rspec/rspec-core) from 3.9.0 to 3.9.1.
- [Release notes](https://github.com/rspec/rspec-core/releases)
- [Changelog](https://github.com/rspec/rspec-core/blob/master/Changelog.md)
- [Commits](rspec/rspec-core@v3.9.0...v3.9.1)

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

Author: dependabot-preview[bot]

Gemfile.lock

@@ -287,8 +287,8 @@ GEM
       declarative-option (< 0.2.0)
       uber (< 0.2.0)
     retriable (3.1.2)
-    rspec-core (3.9.0)
-      rspec-support (~> 3.9.0)
+    rspec-core (3.9.1)
+      rspec-support (~> 3.9.1)
     rspec-expectations (3.9.0)
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.9.0)