chore(deps): bump summit-registration-lite to 7.0.6 (event-site 2.1.58)

[gcutrini]

ref: https://app.clickup.com/t/86ba9qt03

Summary

• Bumps summit-registration-lite to 7.0.6 to pick up:
  • PR Fix allow empty password #148 promo-code discovery polish (multi-code suppression, re-validate on ticket switch, auto-switch on Apply, ticket-aware suggestion copy) -- this is the QA-bound work, ref above.
  • PR feat: add new Registration External Link setting #145 clock-provider migration (stops per-second re-renders in the registration widget) -- perf fix, validated internally (https://app.clickup.com/t/86b8dm4da), nothing user-facing for QA to script against.
• Version: 2.1.57 → 2.1.58.

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