Release v1.6.2

Added

• Added native Linux arm64 wheel builds to the latest and release workflows, with platform-specific wheel artifact names to avoid artifact collisions. @hectcastro (#372)
• CachingEOPProvider / CachingSpaceWeatherProvider (and initialize_eop() / initialize_sw()) now seed a missing cache from the compiled-in bundled data, so EOP and space-weather initialization succeed offline without an immediate network download. @duncaneddy (#374)
• EOP and space-weather downloads now retry transient failures (connection errors, timeouts, HTTP 429/5xx) with exponential backoff and jitter (up to 4 attempts). @duncaneddy (#374)

Changed

• Changed standard EOP product source to USNO finals2000A.all. @duncaneddy (#373)
• Changed C04 EOP product source to Paris Observatory C04 Product. @duncaneddy (#373)
• Download failure messages now include the attempted URL and number of attempts. @duncaneddy (#374)
• Consolidated EOP and space-weather download logic into a shared utils::download helper (internal refactor, no API change). @duncaneddy (#374)

Fixed

• Fix compilation issue due to transitive dependency breaking change in ureq/time crates. Pin time until issue is resolved. @duncaneddy (#373)
• Fixed issue with failing tests due to inability to update outdated EOP products. @duncaneddy (#373)
• initialize_eop() / initialize_sw() no longer fail on a fresh/empty cache when the remote EOP or space-weather server is transiently unreachable (e.g. Standard EOP download request failed: io: Connection refused in CI); bundled data is used instead. @duncaneddy (#374)