Log Message:
devel/ruby-rspec-mocks: update to 3.9.1

Update ruby-rspec-mocks to 3.9.1.

### 3.9.1 / 2019-12-31
[Full Changelog](http://github.com/rspec/rspec-mocks/compare/v3.9.0...v3.9.1)

Bug Fixes:

* Trigger `RSpec::Mocks.configuration.verifying_double_callbacks` when using
  `allow_any_instance_of` or `expect_any_instance_of` (Daniel Orner, #1309)