update codeowners for new cdn path (#1364)

### Description

update codeowners to include cdn github teams 

### Demo URL

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Provide a URL to a live deployment where we can test your PR. If a demo
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### Type of Change

- [ ] New Example
- [ ] Example updates (Bug fixes, new features, etc.)
- [ ] Other (changes to the codebase, but not to examples)

### New Example Checklist

- [ ] 🛫 `npm run new-example` was used to create the example
- [ ] 📚 The template wasn't used but I carefuly read the [Adding a new
example](https://github.com/vercel/examples#adding-a-new-example) steps
and implemented them in the example
- [ ] 📱 Is it responsive? Are mobile and tablets considered?

Author: pranavkarthik10

.github/CODEOWNERS

@@ -18,3 +18,5 @@ build-output-api @tootallnate @lfades @lpalmes
 vercel-tutor @chibicode
 
 microfrontends @kitfoster @lazarv @mknichel
+
+cdn @vercel/edge-ingress @vercel/edge-content @vercel/edge-security @pranavkarthik10