build(deps): bump rspec-core from 3.13.5 to 3.13.6

Bumps [rspec-core](https://github.com/rspec/rspec) from 3.13.5 to 3.13.6.
- [Changelog](https://github.com/rspec/rspec/blob/rspec-core-v3.13.6/rspec-core/Changelog.md)
- [Commits](rspec/rspec@rspec-core-v3.13.5...rspec-core-v3.13.6)

---
updated-dependencies:
- dependency-name: rspec-core
  dependency-version: 3.13.6
  dependency-type: indirect
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

Gemfile.lock

@@ -65,7 +65,7 @@ GEM
       rspec-core (~> 3.13.0)
       rspec-expectations (~> 3.13.0)
       rspec-mocks (~> 3.13.0)
-    rspec-core (3.13.5)
+    rspec-core (3.13.6)
       rspec-support (~> 3.13.0)
     rspec-expectations (3.13.5)
       diff-lcs (>= 1.2.0, < 2.0)