Add changelog entries from botocore

Author: aws-sdk-python-automation

.changes/next-release/feature-bedrock-26426.json

@@ -0,0 +1,5 @@
+{
+  "type": "feature",
+  "category": "``bedrock``",
+  "description": "Add support for retrieving a Bearer token from environment variables to enable bearer authentication with Bedrock services."
+}