Update dependency botocore to v1.26.8

This MR contains the following updates:

Package	Type	Update	Change
botocore	ironbank-pypi	patch	1.26.7 -> 1.26.8

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Release Notes

boto/botocore

v1.26.8

Compare Source

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• api-change:secretsmanager: Documentation updates for Secrets Manager
• api-change:fsx: This release adds root squash support to FSx for Lustre to restrict root level access from clients by mapping root users to a less-privileged user/group with limited permissions.
• api-change:lookoutmetrics: Adding AthenaSourceConfig for MetricSet APIs to support Athena as a data source.
• api-change:voice-id: VoiceID will now automatically expire Speakers if they haven't been accessed for Enrollment, Re-enrollment or Successful Auth for three years. The Speaker APIs now return a "LastAccessedAt" time for Speakers, and the EvaluateSession API returns "SPEAKER_EXPIRED" Auth Decision for EXPIRED Speakers.
• api-change:cloudformation: Add a new parameter statusReason to DescribeStackSetOperation output for additional details
• api-change:apigateway: Documentation updates for Amazon API Gateway
• api-change:apprunner: Documentation-only update added for CodeConfiguration.
• api-change:sagemaker: Amazon SageMaker Autopilot adds support for manually selecting features from the input dataset using the CreateAutoMLJob API.

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