chore: enable trusted publishing

[jkowalleck]

• depends on: chore: create a release pipeline #46

goal: enable trusted publishing for https://rubygems.org/gems/cyclonedx-ruby

[jkowalleck]

example: #47 (comment)

👋 Hi! Here is a Trusted Publishing to RubyGems.org example that we use in Faraday.
https://github.com/lostisland/faraday-retry/blob/main/.github/workflows/publish.yml