Update changelog based on model updates

.changes/next-release/api-change-apprunner-67982.json

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+{
+  "type": "api-change",
+  "category": "``apprunner``",
+  "description": "AWS App Runner adds a Node.js 16 runtime."
+}

.changes/next-release/api-change-ec2-6128.json

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+{
+  "type": "api-change",
+  "category": "``ec2``",
+  "description": "Letting external AWS customers provide ImageId as a Launch Template override in FleetLaunchTemplateOverridesRequest"
+}

.changes/next-release/api-change-lexv2models-7706.json

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+{
+  "type": "api-change",
+  "category": "``lexv2-models``",
+  "description": "Update lexv2-models command to latest version"
+}

.changes/next-release/api-change-lightsail-39266.json

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+{
+  "type": "api-change",
+  "category": "``lightsail``",
+  "description": "This release adds Instance Metadata Service (IMDS) support for Lightsail instances."
+}

.changes/next-release/api-change-nimble-14900.json

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+{
+  "type": "api-change",
+  "category": "``nimble``",
+  "description": "Amazon Nimble Studio adds support for on-demand Amazon Elastic Compute Cloud (EC2) G3 and G5 instances, allowing customers to utilize additional GPU instance types for their creative projects."
+}

.changes/next-release/api-change-ssm-52296.json

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+{
+  "type": "api-change",
+  "category": "``ssm``",
+  "description": "This release adds new SSM document types ConformancePackTemplate and CloudFormation"
+}

.changes/next-release/api-change-wafv2-28936.json

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+{
+  "type": "api-change",
+  "category": "``wafv2``",
+  "description": "Add the default specification for ResourceType in ListResourcesForWebACL."
+}