Bump guzzlehttp/guzzle from 7.3.0 to 7.4.3 in /scormcloud

Bumps [guzzlehttp/guzzle](https://github.com/guzzle/guzzle) from 7.3.0 to 7.4.3.
- [Release notes](https://github.com/guzzle/guzzle/releases)
- [Changelog](https://github.com/guzzle/guzzle/blob/master/CHANGELOG.md)
- [Commits](guzzle/guzzle@7.3.0...7.4.3)

---
updated-dependencies:
- dependency-name: guzzlehttp/guzzle
  dependency-type: direct:production
...

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

Author: dependabot[bot]

scormcloud/composer.json

@@ -10,7 +10,7 @@
     ],
     "require": {
         "rustici-software/scormcloud-api-v2-client-php": "^2.0",
-        "guzzlehttp/guzzle": "7.3.0"
+        "guzzlehttp/guzzle": "7.4.3"
     },
     "config": {
       "vendor-dir": "vendor"