Update the date as of August 26 (#866)

Author: sunghee-hwang

index.bs

@@ -11,7 +11,7 @@ URL: https://aomediacodec.github.io/iamf
 !Previously approved version: <a href="https://aomediacodec.github.io/iamf/v1.0.0-errata.html">https://aomediacodec.github.io/iamf/v1.0.0-errata.html</a>
 !Latest approved version: <a href="https://aomediacodec.github.io/iamf/latest-approved.html">https://aomediacodec.github.io/iamf/latest-approved.html</a>
 !Latest draft version: <a href="https://aomediacodec.github.io/iamf/latest-draft.html">https://aomediacodec.github.io/iamf/latest-draft.html</a>
-Date: 2024-07-01
+Date: 2024-08-26
 !Reference Implementation: <a href="https://github.com/AOMediaCodec/libiamf/">libiamf</a>
 Abstract: This document specifies the Immersive Audio (IA) model, the standalone IA Sequence format, and the [[!ISO-BMFF]]-based IA container format.
 Local Boilerplate: footer yes