Update CHANGELOG (#1333)

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

Author: api-clients-generation-pipeline[bot]

CHANGELOG.md

@@ -1,5 +1,37 @@
 # Changelog
 
+## 2.9.0 / 2023-02-08
+
+### Fixed
+* Mark timeseries values as nullable by @api-clients-generation-pipeline in https://github.com/DataDog/datadog-api-client-python/pull/1296
+* Fix APIs default init by @therve in https://github.com/DataDog/datadog-api-client-python/pull/1303
+* Add namespaces attribute and rename excluded_attributes in SDS Public API by @api-clients-generation-pipeline in https://github.com/DataDog/datadog-api-client-python/pull/1308
+* Set macV as `type any` by @api-clients-generation-pipeline in https://github.com/DataDog/datadog-api-client-python/pull/1323
+### Added
+* Add Support for Incident Management Search API by @api-clients-generation-pipeline in https://github.com/DataDog/datadog-api-client-python/pull/1251
+* Add TOTP parameters to Synthetics test options by @api-clients-generation-pipeline in https://github.com/DataDog/datadog-api-client-python/pull/1291
+* Add httpVersion option to Synthetics API tests by @api-clients-generation-pipeline in https://github.com/DataDog/datadog-api-client-python/pull/1300
+* Add deprecationDate to security monitoring rule response by @api-clients-generation-pipeline in https://github.com/DataDog/datadog-api-client-python/pull/1301
+* Add new group by configuration to list stream widget by @api-clients-generation-pipeline in https://github.com/DataDog/datadog-api-client-python/pull/1298
+* Add synthetics advanced scheduling by @api-clients-generation-pipeline in https://github.com/DataDog/datadog-api-client-python/pull/1282
+* Add notification preset enum field to monitor options by @api-clients-generation-pipeline in https://github.com/DataDog/datadog-api-client-python/pull/1305
+* Add support for Cloudflare integration API by @api-clients-generation-pipeline in https://github.com/DataDog/datadog-api-client-python/pull/1304
+* Add support for Fastly account API by @api-clients-generation-pipeline in https://github.com/DataDog/datadog-api-client-python/pull/1233
+* Add monitor configuration policies by @api-clients-generation-pipeline in https://github.com/DataDog/datadog-api-client-python/pull/1307
+* Support is_cspm_enabled field in GCP integrations by @api-clients-generation-pipeline in https://github.com/DataDog/datadog-api-client-python/pull/1316
+* Add run workflow widget to dashboard schema by @api-clients-generation-pipeline in https://github.com/DataDog/datadog-api-client-python/pull/1309
+* Add new missing enum values for `aggregation` and `detectionMethod` by @api-clients-generation-pipeline in https://github.com/DataDog/datadog-api-client-python/pull/1325
+* Add region to estimated cost and historical cost response by @api-clients-generation-pipeline in https://github.com/DataDog/datadog-api-client-python/pull/1326
+* Add Usage Metering container_excl_agent_usage fields by @api-clients-generation-pipeline in https://github.com/DataDog/datadog-api-client-python/pull/1328
+* Add event_stream fields to dashboard list stream widget by @api-clients-generation-pipeline in https://github.com/DataDog/datadog-api-client-python/pull/1329
+### Changed
+* Remove indexed logs from Usage Attribution by @api-clients-generation-pipeline in https://github.com/DataDog/datadog-api-client-python/pull/1290
+* Remove pagination parameter from CI visibility aggregate endpoints by @api-clients-generation-pipeline in https://github.com/DataDog/datadog-api-client-python/pull/1295
+* Move Service account create from users to service accounts by @api-clients-generation-pipeline in https://github.com/DataDog/datadog-api-client-python/pull/1313
+
+
+**Full Changelog**: https://github.com/DataDog/datadog-api-client-python/compare/2.8.0...2.9.0
+
 ## 2.8.0 / 2023-01-05
 
 ### Fixed