Update dependency aws/aws-sdk-php to v3.323.4

This MR contains the following updates:

Package	Type	Update	Change
aws/aws-sdk-php (source)	require	patch	3.323.3 -> 3.323.4

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Release Notes

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

v3.323.4

Compare Source

• Aws\CodePipeline - AWS CodePipeline introduces a Compute category

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