v6.3.0

[6.3.0] - 2026-07-15

Added

• Added Conjur::API#fetch_policy for retrieving policy data from the server,
  as YAML or JSON, with optional tree depth and size limits.

Changed

• CI uses Conjur Enterprise 1.27.0+, which removed the GET /public_keys endpoint
  (CNJR-11339). Dropped the Cucumber scenario that exercised that API; the client
  method remains for open-source Conjur.
• Retrieve the Cucumber admin API key via conjurctl in test.sh instead of rake,
  avoiding Rails boot output corrupting the key on current Conjur images.
• CI now tests against Ruby 3.3, 3.4, and 4.0. Dropped Ruby 3.2 (end of life)
  and raised the minimum supported Ruby version accordingly.