Update changelog based on model updates

Author: aws-sdk-python-automation

.changes/next-release/api-change-ce-43120.json

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+{
+  "type": "api-change",
+  "category": "``ce``",
+  "description": "Added endpoint support for eusc-de-east-1 region."
+}

.changes/next-release/api-change-medicalimaging-67530.json

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+{
+  "type": "api-change",
+  "category": "``medical-imaging``",
+  "description": "Added support for OpenID Connect (OIDC) custom authorizer"
+}

.changes/next-release/api-change-observabilityadmin-81862.json

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+{
+  "type": "api-change",
+  "category": "``observabilityadmin``",
+  "description": "CloudWatch Observability Admin adds the ability to enable telemetry centralization in customers' Organizations. The release introduces new APIs to manage centralization rules, which define settings to replicate telemetry data to a central destination in the customers' Organization."
+}

.changes/next-release/api-change-s3control-52360.json

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+{
+  "type": "api-change",
+  "category": "``s3control``",
+  "description": "Introduce three new encryption filters: EncryptionType (SSE-S3, SSE-KMS, DSSE-KMS, SSE-C, NOT-SSE), KmsKeyArn (for SSE-KMS and DSSE-KMS), and BucketKeyEnabled (for SSE-KMS)."
+}