Remove redundant require 'set' for Ruby 3.3 compatibility

[neddp]

Summary

• Remove require 'set' from lib/cloud/openstack.rb — Set is part of Ruby core since 3.2, and RuboCop 1.78 (Lint/RedundantRequireStatement) now flags it as an offense under Ruby 3.3.

Why

The bump-bosh-packages CI job vendors openstack-ruby-3.3 and then runs unit specs. With Ruby 3.3 the bundled RuboCop treats require 'set' as redundant and fails the build. This is a one-line fix to unblock that job.

Test plan

• run-unit-specs passes on CI after merge

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