Bump rubocop from 1.57.2 to 1.58.0 and fix offenses

Bumps [rubocop](https://github.com/rubocop/rubocop) from 1.57.2 to 1.58.0.
- [Release notes](https://github.com/rubocop/rubocop/releases)
- [Changelog](https://github.com/rubocop/rubocop/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rubocop/rubocop/compare/v1.57.2...v1.58.0)

---
updated-dependencies:
- dependency-name: rubocop
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

spec/lib/runner/strategy/poseidon/connection_spec.rb

@@ -25,7 +25,7 @@ RSpec.describe Runner::Strategy::Poseidon::Connection do
 
     shared_examples 'calls a message handler' do
       it 'calls the corresponding handler' do
-        handler = "handle_#{message[:type]}".to_sym
+        handler = :"handle_#{message[:type]}"
         expect(connection).to receive(handler)
         process_message
       end