Update CHANGELOG (#2100)

Co-authored-by: api-clients-generation-pipeline[bot] <54105614+api-clients-generation-pipeline[bot]@users.noreply.github.com>

CHANGELOG.md

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+## 3.30.0 (September 12, 2023)
+
+### BUGFIXES
+* [datadog_downtimes_schedule] Fix downtimes schedule with monitor id identifier by @skarimo in https://github.com/DataDog/terraform-provider-datadog/pull/2092
+### IMPROVEMENTS
+* [datadog_synthetics_tests] Retrieve synthetics test in datasource by making 2 api calls by @skarimo in https://github.com/DataDog/terraform-provider-datadog/pull/2068
+* [datadog_dashboard] Add support for sunburst widget request style by @matt-miller-ddog in https://github.com/DataDog/terraform-provider-datadog/pull/2089
+### FEATURES
+* [datadog_synthetics_test] Add support for metadata for Synthetics grpc tests by @romainberger in https://github.com/DataDog/terraform-provider-datadog/pull/2094
+### NOTES
+* [datadog_downtime_schedule] GA the resource by @carlmartensen in https://github.com/DataDog/terraform-provider-datadog/pull/2090
+* [datadog_provider] Bump datadog-api-client to `2.17.0` by @skarimo in https://github.com/DataDog/terraform-provider-datadog/pull/2099
+
+
+**Full Changelog**: https://github.com/DataDog/terraform-provider-datadog/compare/v3.29.0...v3.30.0
+
 ## 3.29.0 (August 23, 2023)
 
 ### BUGFIXES