Update aws/aws-sdk-php requirement from ~3.320.7 to ~3.321.11

[dependabot[bot]]

Updates the requirements on aws/aws-sdk-php to permit the latest version.

Release notes

Sourced from aws/aws-sdk-php's releases.

Version 3.321.11

• Aws\Amplify - Doc only update to Amplify to explain platform setting for Next.js 14 SSG only applications
• Aws\IVS - Updates to all tags descriptions.
• Aws\ivschat - Updates to all tags descriptions.

Commits

• bbd357d 3.321.11 release
• f5ecedd Update models for release
• a81a9a2 3.321.10 release
• b568487 Update models for release
• 5de5099 3.321.9 release
• 7253c9d Update models for release
• 501f798 chore: Modified bug issue template to add checkbox to report potential regres...
• df45665 3.321.8 release
• 5021201 Update models for release
• c64ee32 3.321.7 release
• Additional commits viewable in compare view

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