Add Symfony 8 support (#251)

* Initial plan

* Add Symfony 8 support to composer.json and update README

Co-authored-by: bytestream <1788397+bytestream@users.noreply.github.com>

* Fix version constraint consistency for symfony/translation

Co-authored-by: bytestream <1788397+bytestream@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: bytestream <1788397+bytestream@users.noreply.github.com>

Author: Copilot

README.md

@@ -13,7 +13,7 @@ Compatibility with Symfony
 
 | CaptchaBundle |  Symfony  |   PHP    |
 |:-------------:|:---------:|:--------:|
-|     >=2.3     | 6.* - 7.* | >= 8.0.2 |
+|     >=2.3     | 6.* - 8.* | >= 8.0.2 |
 |     2.2.*     | 5.* - 6.* |  >= 7.1  |
 |     2.1.*     | 4.* - 5.* |  >= 7.1  |
 |     2.0.*     | 2.8 - 3.* | >= 5.3.9 |

composer.json

@@ -20,9 +20,9 @@
         "php": ">=8.0.2",
         "ext-gd": "*",
         "gregwar/captcha": "^1.2.1",
-        "symfony/form": "~6.0|~7.0",
-        "symfony/framework-bundle": "~6.0|~7.0",
-        "symfony/translation": "~6.0|^7.0",
+        "symfony/form": "~6.0|~7.0|~8.0",
+        "symfony/framework-bundle": "~6.0|~7.0|~8.0",
+        "symfony/translation": "~6.0|~7.0|~8.0",
         "twig/twig": "^3.0"
     },
     "autoload": {