Add changelog entries from botocore

.changes/next-release/api-change-amplify-19425.json

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+{
+  "type": "api-change",
+  "category": "``amplify``",
+  "description": "[``botocore``] Doc only update to the description of basicauthcredentials to describe the required encoding and format."
+}

.changes/next-release/api-change-connect-91398.json

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+{
+  "type": "api-change",
+  "category": "``connect``",
+  "description": "[``botocore``] This release adds support for configuring a custom chat duration when starting a new chat session via the StartChatContact API. The default value for chat duration is 25 hours, minimum configurable value is 1 hour (60 minutes) and maximum configurable value is 7 days (10,080 minutes)."
+}

.changes/next-release/api-change-ec2-99428.json

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+{
+  "type": "api-change",
+  "category": "``ec2``",
+  "description": "[``botocore``] X2ezn instances are powered by Intel Cascade Lake CPUs that deliver turbo all core frequency of up to 4.5 GHz and up to 100 Gbps of networking bandwidth"
+}

.changes/next-release/api-change-kafka-83968.json

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+{
+  "type": "api-change",
+  "category": "``kafka``",
+  "description": "[``botocore``] Amazon MSK has updated the CreateCluster and UpdateBrokerStorage API that allows you to specify volume throughput during cluster creation and broker volume updates."
+}

.changes/next-release/api-change-opensearch-3298.json

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+{
+  "type": "api-change",
+  "category": "``opensearch``",
+  "description": "[``botocore``] Allows customers to get progress updates for blue/green deployments"
+}