Generator: Update SDK /services/opensearch (#486)

* Generate opensearch

* Update CHANGELOG

---------

Co-authored-by: vicentepinto98 <[email protected]>

Author: stackit-pipeline

services/opensearch/CHANGELOG.md

@@ -1,3 +1,10 @@
+## v0.14.0 (2024-05-13)
+
+- **Feature**: New method `GetMetrics` to get the latest metrics for cpu load, memory and disk usage for an instance
+- **Feature**: New method `ListBackups` to list the backups for an instance
+- **Breaking change**: `ListMetricsResponse` type (previously unused) renamed to `GetMetricsResponse`
+- **Breaking change**: Deleted unused data types
+
 ## v0.13.0 (2024-04-11)
 
 - **Breaking change**: Fields removed from `RawCredentials`: `RouteServiceUrl`, `SyslogDrainUrl`, `VolumeMounts`.