Update release-notes.md

Addung pgvector new version

Author: denzilribeiro

articles/postgresql/flexible-server/release-notes.md

@@ -23,6 +23,7 @@ This page provides latest news and updates regarding feature additions, engine v
 * Public preview of [Major Version Upgrade Support for PostgreSQL 16](concepts-major-version-upgrade.md) for Azure Database for PostgreSQL flexible server.
 * Public preview of [real-time language translations](generative-ai-azure-cognitive.md#language-translation) with azure_ai extension on Azure Database for PostgreSQL flexible server.
 * Public preview of [real-time machine learning predictions](generative-ai-azure-machine-learning.md) with azure_ai extension on Azure Database for PostgreSQL flexible server.
+* General availability of version 0.6.0 of [vector](how-to-use-pgvector.md) extension on Azure Database for PostgreSQL flexible server.
 
 ## Release: February 2024
 * Support for [minor versions](./concepts-supported-versions.md) 16.1, 15.5, 14.10, 13.13, 12.17, 11.22 <sup>$</sup>