[TASK] Ensure compatibility with all currently supported Symfony vers…

…ions

As this project is a library, it should be installable with as many
Symfony versions that still are supported in order to make it
usable across as many projects as possible.

So reinstate compatibility with Symfony 5.4, and add compatibility with
Symfony 7.0 and 7.1.

At the moment, Symfony 5.4, 6.4, 7.0 and 7.1 are still supported
by the Symfony project:

https://symfony.com/releases

Closes #301

CHANGELOG.md

@@ -5,6 +5,12 @@ This project adheres to [Semantic Versioning](https://semver.org/).
 Updates should follow the [Keep a CHANGELOG](http://keepachangelog.com/)
 principles.
 
+## [3.2.0]
+
+### Added
+
+- Ensure compatibility with all currently supported Symfony versions (#304)
+
 ## [3.1.0]
 
 ### Added

composer.json

@@ -30,10 +30,10 @@
         "ext-fileinfo": "*",
         "ext-json": "*",
         "ext-zip": "*",
-        "symfony/finder": "^6.0",
-        "symfony/http-foundation": "^6.0",
-        "symfony/mime": "^6.0",
-        "symfony/string": "^6.0"
+        "symfony/finder": "^5.4 || ^6.4 || ^7.0",
+        "symfony/http-foundation": "^5.4 || ^6.4 || ^7.0",
+        "symfony/mime": "^5.4 || ^6.4 || ^7.0",
+        "symfony/string": "^5.4 || ^6.4 || ^7.0"
     },
     "require-dev": {
         "dereuromark/composer-prefer-lowest": "^0.1.10",