Update CODEOWNERS (#4620)

# Motivation

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# Changes

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# Tests

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have been done -->

# Todos

- [ ] Add entry to changelog (if necessary).

.github/CODEOWNERS

@@ -1,2 +1 @@
-# The codebase is owned by the Governance & Identity Experience team at DFINITY
-# For questions, reach out to: <[email protected]>
+* @dfinity/nns-team