Flaky test in JRuby test matrix entry

[halfbyte]

See failed action run on master

This usually gets green on first retry.

Here's the test output:

1) Honeybadger::Worker#shutdown when throttled during shutdown warns the logger when the queue has additional items
     Failure/Error: expect(config.logger).to receive(:warn).with(/throttled/i)

       (#<Honeybadger::Logging::ConfigLogger:0x1e95fc31 @tty_level=0, @config=#<Honeybadger::Config:0x395ac2e5 @ruby={:logger=>#<Logger:0x4a2891d1 @default_formatter=#<Logger::Formatter:0x7b6d88d1 @datetime_format=nil>, @level=0, @progname=nil, @formatter=nil, @logdev=#<Logger::LogDevice:0x14cf30b3 @shift_age=0, @shift_period_suffix="%Y%m%d", @filename="/dev/null", @dev=#<File:/dev/null>, @mon_mutex=#<Thread::Mutex:0x38159192>, @shift_size=1048576, @mon_owner=nil, @mon_count=0>>, :debug=>true, :backend=>"null"}, @env={}, @framework={}, @logger=#<Honeybadger::Logging::ConfigLogger:0x363d3958 @tty_level=0, @config=#<Honeybadger::Config:0x395ac2e5 ...>, @logger=#<Logger:0x4a2891d1 @default_formatter=#<Logger::Formatter:0x7b6d88d1 @datetime_format=nil>, @level=0, @progname=nil, @formatter=nil, @logdev=#<Logger::LogDevice:0x14cf30b3 @shift_age=0, @shift_period_suffix="%Y%m%d", @filename="/dev/null", @dev=#<File:/dev/null>, @mon_mutex=#<Thread::Mutex:0x38159192>, @shift_size=1048576, @mon_owner=nil, @mon_count=0>>, @tty=false>, @yaml={}, @backend=#<Honeybadger::Backend::Null:0x2181144e @config=#<Honeybadger::Config:0x395ac2e5 ...>>>, @logger=#<Logger:0x4a2891d1 @default_formatter=#<Logger::Formatter:0x7b6d88d1 @datetime_format=nil>, @level=0, @progname=nil, @formatter=nil, @logdev=#<Logger::LogDevice:0x14cf30b3 @shift_age=0, @shift_period_suffix="%Y%m%d", @filename="/dev/null", @dev=#<File:/dev/null>, @mon_mutex=#<Thread::Mutex:0x38159192>, @shift_size=1048576, @mon_owner=nil, @mon_count=0>>, @tty=false>).warn(/throttled/i)
           expected: 1 time with arguments: (/throttled/i)
           received: 0 times
     # ./spec/unit/honeybadger/worker_spec.rb:243:in `block in <main>'
     # ./vendor/bundle/jruby/2.5.0/gems/webmock-3.19.1/lib/webmock/rspec.rb:39:in `block in /home/runner/work/honeybadger-ruby/honeybadger-ruby/vendor/bundle/jruby/2.5.0/gems/webmock-3.19.1/lib/webmock/rspec.rb'
     # ./vendor/bundle/jruby/2.5.0/gems/aruba-2.1.0/lib/aruba/rspec.rb:38:in `block in /home/runner/work/honeybadger-ruby/honeybadger-ruby/vendor/bundle/jruby/2.5.0/gems/aruba-2.1.0/lib/aruba/rspec.rb'
     # ./vendor/bundle/jruby/2.5.0/gems/aruba-2.1.0/lib/aruba/rspec.rb:25:in `block in /home/runner/work/honeybadger-ruby/honeybadger-ruby/vendor/bundle/jruby/2.5.0/gems/aruba-2.1.0/lib/aruba/rspec.rb'