Update CHANGELOG for version 1.0.8b

Improved the performance of the reindex command.

Author: mhaya

CHANGELOG.md

@@ -12,6 +12,10 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 ### Fixed
 ### Security
 
+## [v1.0.8b] 2025-10-16
+### Changed
+- Improved the performance of the reindex command.
+
 ## [v1.0.8a] 2025-07-08
 ### Fixed
 - Fixed an issue where the tika library was not included in the Docker image.
@@ -157,4 +161,4 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 [v1.0.7a2] https://github.com/RCOSDP/weko/compare/v1.0.7a...v1.0.7a2
 [v1.0.7b] https://github.com/RCOSDP/weko/compare/v1.0.7a2...v1.0.7b
 [v1.0.8] https://github.com/RCOSDP/weko/compare/v1.0.7b...v1.0.8
-[v1.0.8a] https://github.com/RCOSDP/weko/compare/v1.0.8...v1.0.8a
+[v1.0.8a] https://github.com/RCOSDP/weko/compare/v1.0.8...v1.0.8a