Add changelog entries from botocore

Author: aws-sdk-python-automation

.changes/next-release/api-change-mediaconvert-1839.json

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+{
+  "type": "api-change",
+  "category": "``mediaconvert``",
+  "description": "[``botocore``] AWS Elemental MediaConvert SDK has added support for the pass-through of WebVTT styling to WebVTT outputs, pass-through of KLV metadata to supported formats, and improved filter support for processing 444/RGB content."
+}

.changes/next-release/api-change-mediapackagevod-47237.json

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+{
+  "type": "api-change",
+  "category": "``mediapackage-vod``",
+  "description": "[``botocore``] This release adds ScteMarkersSource as an available field for Dash Packaging Configurations. When set to MANIFEST, MediaPackage will source the SCTE-35 markers from the manifest. When set to SEGMENTS, MediaPackage will source the SCTE-35 markers from the segments."
+}

.changes/next-release/api-change-wafv2-34654.json

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+{
+  "type": "api-change",
+  "category": "``wafv2``",
+  "description": "[``botocore``] Add a new CurrentDefaultVersion field to ListAvailableManagedRuleGroupVersions API response; add a new VersioningSupported boolean to each ManagedRuleGroup returned from ListAvailableManagedRuleGroups API response."
+}