Update changelog based on model updates

Author: aws-sdk-python-automation

.changes/next-release/api-change-ecr-69231.json

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+{
+  "type": "api-change",
+  "category": "``ecr``",
+  "description": "Add support for Image Tag Mutability Exception feature, allowing repositories to define wildcard-based patterns that override the default image tag mutability settings."
+}

.changes/next-release/api-change-emr-69028.json

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+{
+  "type": "api-change",
+  "category": "``emr``",
+  "description": "This release adds new parameter 'ExtendedSupport' in AWS EMR RunJobFlow, ModifyCluster and DescribeCluster API."
+}

.changes/next-release/api-change-lambda-77104.json

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+{
+  "type": "api-change",
+  "category": "``lambda``",
+  "description": "This release migrated the model to Smithy keeping all features unchanged."
+}

.changes/next-release/api-change-neptunedata-53801.json

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+{
+  "type": "api-change",
+  "category": "``neptunedata``",
+  "description": "This release updates the supported regions for Neptune API to include current AWS regions."
+}