chore(CHANGELOG): synthetics feature was released in stable version (#27496)

Was erroneously added to the alpha changelog because the synthetics-alpha module still exists. Release notes have also been updated to the same effect

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*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

Author: kaizencc

CHANGELOG.v2.alpha.md

@@ -9,10 +9,6 @@ All notable changes to this project will be documented in this file. See [standa
 
 * **redshift:** the behavior of redshift tables has changed. UPDATE action will not be triggered on new table names and instead be triggered on table id changes.
 
-### Features
-
-* **synthetics:** CloudWatch Synthetics NodeJS Pupeteer 6.0 Runtime with NodeJS 18 ([#27339](https://github.com/aws/aws-cdk/issues/27339)) ([e48af04](https://github.com/aws/aws-cdk/commit/e48af04c0b483d705d99c97a1f7bf8c6cd8e71c6)), closes [#27337](https://github.com/aws/aws-cdk/issues/27337)
-
 
 ### Bug Fixes
 

CHANGELOG.v2.md

@@ -13,6 +13,7 @@ All notable changes to this project will be documented in this file. See [standa
 * **cli:** declare `cdk import` stable ([#27390](https://github.com/aws/aws-cdk/issues/27390)) ([1057ef0](https://github.com/aws/aws-cdk/commit/1057ef0feba8f35ea5d7dc0f011e85e721146ce0))
 * **eks:** support INF2 instance types ([#27373](https://github.com/aws/aws-cdk/issues/27373)) ([bed9b8d](https://github.com/aws/aws-cdk/commit/bed9b8d43c236bc44c11b5b44447c1ea45935ba8))
 * **s3-deployment:** support Fn::Select in renderData() ([#27237](https://github.com/aws/aws-cdk/issues/27237)) ([8b20c11](https://github.com/aws/aws-cdk/commit/8b20c114068cc9e514aefc136516cb2d01df1e1b)), closes [#25504](https://github.com/aws/aws-cdk/issues/25504) [/github.com/aws/aws-cdk/blob/3edd2400bc0c8a86366a29d3a7eef1ef4fa5e016/packages/aws-cdk-lib/aws-elasticloadbalancingv2/lib/alb/application-target-group.ts#L438](https://github.com/aws//github.com/aws/aws-cdk/blob/3edd2400bc0c8a86366a29d3a7eef1ef4fa5e016/packages/aws-cdk-lib/aws-elasticloadbalancingv2/lib/alb/application-target-group.ts/issues/L438)
+* **synthetics:** CloudWatch Synthetics NodeJS Pupeteer 6.0 Runtime with NodeJS 18 ([#27339](https://github.com/aws/aws-cdk/issues/27339)) ([e48af04](https://github.com/aws/aws-cdk/commit/e48af04c0b483d705d99c97a1f7bf8c6cd8e71c6)), closes [#27337](https://github.com/aws/aws-cdk/issues/27337)
 * update AWS Service Spec ([#27375](https://github.com/aws/aws-cdk/issues/27375)) ([26d4afe](https://github.com/aws/aws-cdk/commit/26d4afee04ef2f5b17d0c211c767adc635d2cf37))
 * **rds:** add new RDS versions ([#27351](https://github.com/aws/aws-cdk/issues/27351)) ([e0c9792](https://github.com/aws/aws-cdk/commit/e0c9792811e5e0685729264694b645d147ff52de))