Bump guzzlehttp/guzzle from 6.5.5 to 7.1.1

Bumps [guzzlehttp/guzzle](https://github.com/guzzle/guzzle) from 6.5.5 to 7.1.1.
- [Release notes](https://github.com/guzzle/guzzle/releases)
- [Changelog](https://github.com/guzzle/guzzle/blob/master/CHANGELOG.md)
- [Commits](guzzle/guzzle@6.5.5...7.1.1)

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

Author: dependabot[bot]

composer.json

@@ -13,7 +13,7 @@
     },
     "require": {
         "php": "^7.2.5|^7.3|^7.4",
-        "guzzlehttp/guzzle": "~6.4"
+        "guzzlehttp/guzzle": "~7.1"
     },
     "require-dev": {
         "phpunit/phpunit": "~8.5",