Update changelog based on model updates

Author: aws-sdk-python-automation

.changes/next-release/api-change-ec2-86337.json

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+{
+  "type": "api-change",
+  "category": "``ec2``",
+  "description": "This release adds support to view Network firewall proxy appliances attached to an existing NAT Gateway via DescribeNatGateways API NatGatewayAttachedAppliance structure."
+}

.changes/next-release/api-change-networkfirewall-31899.json

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+{
+  "type": "api-change",
+  "category": "``network-firewall``",
+  "description": "Network Firewall release of the Proxy feature."
+}

.changes/next-release/api-change-organizations-54492.json

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+{
+  "type": "api-change",
+  "category": "``organizations``",
+  "description": "Add support for policy operations on the S3_POLICY and BEDROCK_POLICY policy type."
+}

.changes/next-release/api-change-route53-94825.json

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+{
+  "type": "api-change",
+  "category": "``route53``",
+  "description": "Adds support for new route53 feature: accelerated recovery."
+}