Bump aws/aws-sdk-php from 3.91.4 to 3.92.1

Bumps [aws/aws-sdk-php](https://github.com/aws/aws-sdk-php) from 3.91.4 to 3.92.1.
- [Release notes](https://github.com/aws/aws-sdk-php/releases)
- [Changelog](https://github.com/aws/aws-sdk-php/blob/master/CHANGELOG.md)
- [Commits](https://github.com/aws/aws-sdk-php/compare/3.91.4...3.92.1)

Signed-off-by: dependabot[bot] <support@dependabot.com>

composer.lock

@@ -358,16 +358,16 @@
         },
         {
             "name": "aws/aws-sdk-php",
-            "version": "3.91.4",
+            "version": "3.92.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/aws/aws-sdk-php.git",
-                "reference": "41b67dce3c86da61137b47054d9d52c6ef57b5ec"
+                "reference": "94ecf9ad388d9fd04e8dfe492fd9484f94efb69e"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/aws/aws-sdk-php/zipball/41b67dce3c86da61137b47054d9d52c6ef57b5ec",
+                "url": "https://api.github.com/repos/aws/aws-sdk-php/zipball/94ecf9ad388d9fd04e8dfe492fd9484f94efb69e",
-                "reference": "41b67dce3c86da61137b47054d9d52c6ef57b5ec",
+                "reference": "94ecf9ad388d9fd04e8dfe492fd9484f94efb69e",
                 "shasum": ""
             },
             "require": {
@@ -436,7 +436,7 @@
                 "s3",
                 "sdk"
             ],
-            "time": "2019-04-05T18:10:20+00:00"
+            "time": "2019-04-19T18:08:54+00:00"
         },
         {
             "name": "bacon/bacon-qr-code",