Update newsletter list

[khambir]

• Project Name: The iOS Weekly Brief
• Project URL: https://iosweeklybrief.com
• Project Description: A weekly newsletter with Must/Quick Read picks, a Toolbox section, the iOS job market, and upcoming conferences, each with commentary on why it matters.
• Why it should be added to awesome-swift: A weekly, curated filter for experienced iOS engineers. Each item includes commentary on why it matters, where it breaks, and how it's used in daily production work, written by an iOS engineer with 10+ years of experience. 70+ issues published to date, read by engineers at Meta, Apple, Amazon, GitHub, Capital One, Uber, and Google, across 90+ countries.
• At least 15 stars (GitHub project) — n/a, this is a newsletter with 70+ issues and subscribers in 90+ countries, not a GitHub project
• Support Swift 5 — n/a, this is a newsletter, not a library
• Updated contents.json instead of README
• Lib is fully open sourced, written in Swift and not a wrapper over compiled lib — n/a, this is a newsletter, not a library
• Description does not say "written in Swift" or variant 🤓