Update changelog based on model updates

.changes/next-release/api-change-codebuild-65397.json

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+{
+  "type": "api-change",
+  "category": "``codebuild``",
+  "description": "GitLab Enhancements - Add support for Self-Hosted GitLab runners in CodeBuild. Add group webhooks"
+}

.changes/next-release/api-change-ecr-42844.json

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+{
+  "type": "api-change",
+  "category": "``ecr``",
+  "description": "The `DescribeImageScanning` API now includes `fixAvailable`, `exploitAvailable`, and `fixedInVersion` fields to provide more detailed information about the availability of fixes, exploits, and fixed versions for identified image vulnerabilities."
+}

.changes/next-release/api-change-ecs-96308.json

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+{
+  "type": "api-change",
+  "category": "``ecs``",
+  "description": "This is a documentation only release to address various tickets."
+}

.changes/next-release/api-change-lambda-74303.json

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+{
+  "type": "api-change",
+  "category": "``lambda``",
+  "description": "Support for JSON resource-based policies and block public access"
+}

.changes/next-release/api-change-rds-37666.json

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+{
+  "type": "api-change",
+  "category": "``rds``",
+  "description": "Updates Amazon RDS documentation with configuration information about the BYOL model for RDS for Db2."
+}

.changes/next-release/api-change-ssm-30019.json

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+{
+  "type": "api-change",
+  "category": "``ssm``",
+  "description": "Support for additional levels of cross-account, cross-Region organizational units in Automation. Various documentation updates."
+}