React graph webpart report upgrade to SPFx v1.18.2

[a1mery]

• [ ] New sample
• [x] Bug fix/update
• [ ] Related issues: fixes #X, partially #Y, mentioned in #Z

What's in this Pull Request?

Upgrade sample to SPFx version 1.18.2

Node Version

Node version used: v18.18.0

Checklist

• [x] My pull request affects only ONE sample.
• [x] My sample builds without any warnings
• [x] I have updated the README.md file's Version history. For new samples, created a new README.md file matching this template
• [x] My README.md has at least one static high-resolution screenshot (i.e. not a GIF) located in the assets folder.
• [x] My README.md contains complete setup instructions, including pre-requisites and permissions required
• [x] My solution includes a .nvmrc file indicating the version of Node.js