chore(changelog): update CHANGELOG for Baileys v7.0.0-rc.4 and PostgreSQL connection improvements

- Added entry for Baileys version update to v7.0.0-rc.4.
- Refactored PostgreSQL connection handling and enhanced message processing capabilities.

Author: DavidsonGomes

CHANGELOG.md

@@ -7,6 +7,9 @@
   - Fixed `ERROR: relation "public.Instance" does not exist` issue in migration `20250918182355_add_kafka_integration`
   - Aligned table naming convention with other Evolution API migrations for consistency
   - Resolved database migration failure that prevented Kafka integration setup
+* **Update Baileys Version**: v7.0.0-rc.4
+* Refactor connection with PostgreSQL and improve message handling
+
 
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