Bump guzzlehttp/guzzle from 6.5.8 to 7.5.1

Bumps [guzzlehttp/guzzle](https://github.com/guzzle/guzzle) from 6.5.8 to 7.5.1.
- [Release notes](https://github.com/guzzle/guzzle/releases)
- [Changelog](https://github.com/guzzle/guzzle/blob/7.5/CHANGELOG.md)
- [Commits](guzzle/guzzle@6.5.8...7.5.1)

---
updated-dependencies:
- dependency-name: guzzlehttp/guzzle
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

composer.json

@@ -4,7 +4,7 @@
         "tightenco/jigsaw-docs-template": "^1.1",
         "samdark/sitemap": "^2.4",
         "symfony/process": "^4.3",
-        "guzzlehttp/guzzle": "^6.3",
+        "guzzlehttp/guzzle": "^7.5",
         "erusev/parsedown-extra": "^0.8"
     },
     "autoload": {