Bump organizations chart version to v0.4.4 (org nickname seeding fix)

[rowan-stein]

User request

Update bootstrap to deploy organizations v0.4.4 so org nickname seeding works reliably (required for console e2e: thread creation by participantNickname).

Constraints:

• No direct DB seeding.
• No port-forward or RegisterIdentity bootstrap steps.

Specification

• Update stacks/platform/variables.tf default:
  • organizations_chart_version: 0.4.3 → 0.4.4
• Ensure bootstrap/full-apply CI is green.

References

• organizations release v0.4.4: https://github.com/agynio/organizations/releases/tag/v0.4.4
• Fix PR (organizations): Fix identity header for nickname seeding organizations#25
• Blocked console PR: feat(console): migrate activity lists console-app#90