Update dependency aws/aws-sdk-php to v3.300.4

This MR contains the following updates:

Package	Type	Update	Change
aws/aws-sdk-php (source)	require	patch	3.300.2 -> 3.300.4

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Release Notes

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

v3.300.4

Compare Source

• Aws\QLDB - Clarify possible values for KmsKeyArn and EncryptionDescription.
• Aws\CloudWatchRUM - Doc-only update for new RUM metrics that were added
• Aws\RDS - Add pattern and length based validations for DBShardGroupIdentifier
• Aws\AppSync - Documentation only updates for AppSync

v3.300.3

Compare Source

• Aws\InternetMonitor - This release adds IPv4 prefixes to health events
• Aws\KinesisVideo - Increasing NextToken parameter length restriction for List APIs from 512 to 1024.

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