docs(security): extend code freeze from 7 to 10 days

[mattac21]

No description provided.

[greptile-apps]

Confidence Score: 4/5

[Low risk] Updates code freeze policy documentation.

The PR appears safe to merge, with a non-blocking correction needed in the critical-vulnerability explanation.

Findings

1.  Freeze durations conflict ▶

Summary

Extends the monthly private-repository freeze from seven to ten days.

• Moves creation of the next month's repositories to ten days before the month begins.
• Updates the August example to freeze on August 22.
• The critical-vulnerability section still describes a week-long freeze.

_{Reviews (1) · Last reviewed commit: "extend code freeze from 7 to 10 days" · Reviewed by Greptile}