Update dependency aws/aws-sdk-php to v3.318.0

This MR contains the following updates:

Package	Type	Update	Change
aws/aws-sdk-php (source)	require	minor	3.317.2 -> 3.318.0

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Release Notes

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

v3.318.0

Compare Source

• Aws\Endpoint - Endpoint resolution based on a account id.
• Aws\CognitoIdentityProvider - Advanced security feature updates to include password history and log export for Cognito user pools.
• Aws\CostOptimizationHub - This release adds savings percentage support to the ListRecommendationSummaries API.
• Aws\BedrockAgentRuntime - Introduce model invocation output traces for orchestration traces, which contain the model's raw response and usage.
• Aws\WorkSpaces - Added support for BYOL_GRAPHICS_G4DN_WSP IngestionProcess

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