Add changelog entries from botocore

Author: aws-sdk-python-automation

.changes/next-release/api-change-mediaconvert-47502.json

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+{
+  "type": "api-change",
+  "category": "``mediaconvert``",
+  "description": "[``botocore``] AWS Elemental MediaConvert SDK has added support for 4K AV1 output resolutions & 10-bit AV1 color, the ability to ingest sidecar Dolby Vision XML metadata files, and the ability to flag WebVTT and IMSC tracks for accessibility in HLS."
+}

.changes/next-release/api-change-transcribe-17106.json

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+{
+  "type": "api-change",
+  "category": "``transcribe``",
+  "description": "[``botocore``] Add support for granular PIIEntityTypes when using Batch ContentRedaction."
+}

.changes/next-release/enhancement-Exceptions-94766.json

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+{
+  "type": "enhancement",
+  "category": "Exceptions",
+  "description": "[``botocore``] ProxyConnectionError previously provided the full proxy URL. User info will now be appropriately masked if needed."
+}