Update dependency aws/aws-sdk-php to v3.278.2

This MR contains the following updates:

Package	Type	Update	Change
aws/aws-sdk-php (source)	require	patch	3.278.1 -> 3.278.2

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Release Notes

aws/aws-sdk-php (aws/aws-sdk-php)

v3.278.2

Compare Source

• Aws\Omics - This release provides support for annotation store versioning and cross account sharing for Omics Analytics
• Aws\MediaPackage - Fix SDK logging of certain fields.
• Aws\Transfer - Documentation updates for AWS Transfer Family

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