Add Chinerey "Chi Chi" Ukwu to participants list

[uchinerey-gift]

✨ What I Did

• Added my name with nickname "Chi Chi" to the practice/participants.md file.
• Also Pulled the updated Techtonica Curriculum.

🧠 Why

• Completing the GitHub Collaboration lesson to practice creating branches, commits, and pull requests, and pull updated curriculum.

🪄 How I Tested

• Verified my name appears correctly in the file and committed without errors and additional cohorts name.

🗂️ Branch Details

• Branch name: middle-name
• Merges into: Techtonica/curriculum:main

✅ Ready for review!