5.3.0 - Regenerate from latest OpenAPI spec

[philcluff]

• Adds APIs for retroactive caption generation
• Adds ingest_type field on Assets
• Adds fields related to SRT support including active_ingest_protocol, error_severity,
• Updates Simulcast documentation for SRT support
• Adds several fields to the Data API, including player_error_code, starting_up_viewers, playback_failure_error_type_id, playback_business_exception_error_type_id, video_startup_business_exception_error_type_id, error_severity
• General documentation cleanup across Video and Data APIs

[jsanford8]

should there not be the version somewhere in the code? It looks like it's only in the description/name

[philcluff]

@jsanford8 Only in configuration.go for go, the versioning is actually pulled from the tag name, unless it's a major version bump then there's more complex changes.