Update aws/aws-sdk-php requirement from ~3.311.2 to ~3.320.2

Updates the requirements on [aws/aws-sdk-php](https://github.com/aws/aws-sdk-php) to permit the latest version.
- [Release notes](https://github.com/aws/aws-sdk-php/releases)
- [Commits](aws/aws-sdk-php@3.311.2...3.320.2)

---
updated-dependencies:
- dependency-name: aws/aws-sdk-php
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

composer.json

@@ -11,7 +11,7 @@
 	],
 	"require": {
 		"php": ">=7.1",
-		"aws/aws-sdk-php": "~3.311.2",
+		"aws/aws-sdk-php": "~3.320.2",
 		"composer-plugin-api": "^1.1 || ^2.0",
 		"composer/installers": "^1.12 || ^2.2.0",
 		"segmentio/analytics-php": "~3.7.0"