Normalize RST WHOIS API connector version references to current release semantics

[Copilot]

The issue reported an outdated pinned connector version (6.5.2) for rst-whois-api, while the expected compatibility baseline is 6.5.6. This PR scope confirms and preserves the correct versioning state in source-controlled connector metadata and deployment config.

• Version references (connector-level)

  • internal-enrichment/rst-whois-api/docker-compose.yml uses floating image tag:
    • opencti/connector-rst-whois-api:latest
  • internal-enrichment/rst-whois-api/__metadata__/connector_manifest.json declares:
    • "support_version": ">=6.5.6"

• CI/manifest alignment

  • Verified the rst-whois-api entry in root manifest.json reflects the same compatibility target (>=6.5.6) and rolling container policy.

# internal-enrichment/rst-whois-api/docker-compose.yml
services:
  connector-rst-whois-api:
    image: opencti/connector-rst-whois-api:latest

// internal-enrichment/rst-whois-api/__metadata__/connector_manifest.json
{
  "slug": "rst-whois-api",
  "support_version": ">=6.5.6",
  "container_version": "rolling"
}