chore: update README.md

Author: actions-user

README.md

@@ -658,7 +658,7 @@ All other trademarks referenced herein are the property of their respective owne
 
 
 ---
-Copyright © 2017-2025 [Cloud Posse, LLC](https://cpco.io/copyright)
+Copyright © 2017-2026 [Cloud Posse, LLC](https://cpco.io/copyright)
 
 
 <a href="https://cloudposse.com/readme/footer/link?utm_source=github&utm_medium=readme&utm_campaign=cloudposse/terraform-aws-rds-cluster&utm_content=readme_footer_link"><img alt="README footer" src="https://cloudposse.com/readme/footer/img"/></a>