Add changelog entries from botocore

.changes/next-release/api-change-ivsrealtime-97478.json

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+{
+  "type": "api-change",
+  "category": "``ivs-realtime``",
+  "description": "[``botocore``] adds support for multiple new composition layout configuration options (grid, pip)"
+}

.changes/next-release/api-change-kinesisanalyticsv2-54625.json

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+{
+  "type": "api-change",
+  "category": "``kinesisanalyticsv2``",
+  "description": "[``botocore``] Support new RuntimeEnvironmentUpdate parameter within UpdateApplication API allowing callers to change the Flink version upon which their application runs."
+}

.changes/next-release/api-change-s3-12701.json

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+{
+  "type": "api-change",
+  "category": "``s3``",
+  "description": "[``botocore``] This release makes the default option for S3 on Outposts request signing to use the SigV4A algorithm when using AWS Common Runtime (CRT)."
+}