Use current HEAD of the main branch in tests

Before this chage, we were using a hard-coded version from
composer.json. Now that the version is based on tags, use `dev-main` in
integration tests.

Author: lipskis

tests/Integration/laravel/composer.json

@@ -18,7 +18,7 @@
         "php": "^8.4",
         "laravel/framework": "^12.0",
         "laravel/tinker": "^3.0",
-        "appsignal/appsignal-php": "^0.1.0",
+        "appsignal/appsignal-php": "dev-main",
         "open-telemetry/opentelemetry-auto-laravel": "^1.4"
     },
     "require-dev": {
@@ -94,4 +94,4 @@
     },
     "minimum-stability": "stable",
     "prefer-stable": true
-}
+}

tests/Integration/symfony/composer.json

@@ -21,7 +21,7 @@
         "symfony/routing": "8.0.*",
         "symfony/runtime": "8.0.*",
         "symfony/yaml": "8.0.*",
-        "appsignal/appsignal-php": "^0.1.0",
+        "appsignal/appsignal-php": "dev-main",
         "open-telemetry/opentelemetry-auto-symfony": "^1.1"
     },
     "config": {

tests/Integration/vanilla/composer.json

@@ -11,7 +11,7 @@
     ],
     "require": {
         "php": ">=8.4",
-        "appsignal/appsignal-php": "^0.1.0",
+        "appsignal/appsignal-php": "dev-main",
         "monolog/monolog": "^3.10",
         "symfony/http-client": "^7.2"
     },