Distro release 1.6.13 (#42257)

Author: jeremydvoss

sdk/monitor/azure-monitor-opentelemetry/CHANGELOG.md

@@ -1,18 +1,12 @@
 # Release History
 
-## 1.6.13 (Unreleased)
+## 1.6.13 (2025-07-30)
 
 ### Features Added
 
 - Update to latest OpenTelemetry version after instrumentation breaking change fix. Remove Python 3.8 support.
     ([#42247](https://github.com/Azure/azure-sdk-for-python/pull/42247))
 
-### Breaking Changes
-
-### Bugs Fixed
-
-### Other Changes
-
 ## 1.6.12 (2025-07-21)
 
 ### Bugs Fixed