Update ruby-rspec-core to 3.9.2.
### 3.9.2 / 2020-05-02
[Full Changelog](http://github.com/rspec/rspec-core/compare/v3.9.1...v3.9.2)
Bug Fixes:
* Emit a warning when `around` hook is used with `:context` scope
(Phil Pirozhkov, #2687)
* Prevent invalid implementations of `Exception#cause` from being treated as a
valid cause (and causing strange errors) in `RSpec::Core::Formatters::ExceptionPresenter`.
(Jon Rowe, #2703)
* Correctly detect patterns when `rspec_opts` is an array in `RSpec::Core::RakeTask`.
(Marc-André Lafortune, #2704)
* Make `RSpec.clear_examples` reset example counts for example groups. This fixes
an issue with re-running specs not matching ids. (Agis Anastasopoulos, #2723)
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