TEMP: Use development branches to allow full PHP 8 install

Upstream projects need to be updated to fully support installing Slim
with all development dependencies on PHP 8.

This commit should be removed before the final merge, but is needed to
pass CI.

composer.json

@@ -57,16 +57,17 @@
     "require-dev": {
         "ext-simplexml": "*",
         "adriansuter/php-autoload-override": "^1.2",
+        "fig/http-message-util": "@dev",
         "guzzlehttp/psr7": "^1.6",
         "http-interop/http-factory-guzzle": "^1.0",
-        "laminas/laminas-diactoros": "^2.3",
+        "laminas/laminas-diactoros": "dev-php-8@dev",
         "nyholm/psr7": "^1.3",
-        "nyholm/psr7-server": "^1.0.0",
+        "nyholm/psr7-server": "dev-php8@dev",
         "phpspec/prophecy": "^1.11",
         "phpstan/phpstan": "^0.12.37",
         "phpunit/phpunit": "^8.5 || ^9.3",
-        "slim/http": "^1.0",
-        "slim/psr7": "^1.1",
+        "slim/http": "dev-php8@dev",
+        "slim/psr7": "dev-php8@dev",
         "squizlabs/php_codesniffer": "^3.5"
     },
     "autoload": {
@@ -95,6 +96,13 @@
         "slim/psr7": "Slim PSR-7 implementation. See https://www.slimframework.com/docs/v4/start/installation.html for more information.",
         "php-di/php-di": "PHP-DI is the recommended container library to be used with Slim"
     },
+    "repositories": [
+        { "type": "git", "url": "https://github.com/edudobay/Slim-Http.git" },
+        { "type": "git", "url": "https://github.com/edudobay/Slim-Psr7.git" },
+        { "type": "git", "url": "https://github.com/edudobay/Nyholm-psr7-server.git" },
+        { "type": "git", "url": "https://github.com/ADmad/laminas-diactoros.git" },
+        { "type": "git", "url": "https://github.com/m-ober/http-message-util.git" }
+    ],
     "config": {
         "sort-packages": true
     }