Copy change log updates from release/v1.26.x-0.47bx (open-telemetry#4080)

Author: opentelemetrybot

CHANGELOG.md

@@ -7,7 +7,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
-## Version 1.26.0/0.47b0 (2024-07-23)
+## Version 1.26.0/0.47b0 (2024-07-25)
 
 - Standardizing timeout calculation in measurement consumer collect to nanoseconds
   ([#4074](https://github.com/open-telemetry/opentelemetry-python/pull/4074))