Added support for diactoros v2.

* Main workflow now tests both 1.8 and 2.0 versions of laminas diactoros for each PHP version.
* Use `update` instead of `install` to install composer dependencies to allow `--with` param. This change will also address the following warning in workflow, since composer.lock file is not in version control:
  > No composer.lock file present. Updating dependencies to latest instead of installing from lock file. See https://getcomposer.org/install for more information.

Author: Samuel Nogueira

.github/workflows/main.yml

@@ -9,6 +9,7 @@ jobs:
     strategy:
       matrix:
         php: [7.4, 8.0, 8.1]
+        diactoros: ['diactoros:^1.8.7', 'diactoros:^2.0']
 
     steps:
     - name: Checkout code
@@ -42,11 +43,11 @@ jobs:
 
     - name: Install dependencies on PHP 7
       if: matrix.php < 8
-      run: composer install --prefer-dist --no-progress --no-interaction --no-suggest
+      run: composer update --prefer-dist --no-progress --no-interaction --no-suggest --with='laminas/laminas-${{ matrix.diactoros }}'
 
     - name: Install dependencies on PHP 8
       if: matrix.php >= 8
-      run: composer install --prefer-dist --no-progress --no-interaction --ignore-platform-req=php
+      run: composer update --prefer-dist --no-progress --no-interaction --ignore-platform-req=php  --with='laminas/laminas-${{ matrix.diactoros }}'
 
     - name: Run test suite
       run: php vendor/bin/codecept run functional -c framework-tests

composer.json

@@ -16,7 +16,7 @@
 		"codeception/lib-innerbrowser": "^1.0",
 		"codeception/codeception": "^4.0",
 		"container-interop/container-interop": "^1.2",
-		"laminas/laminas-diactoros": "^1.8.7",
+		"laminas/laminas-diactoros": "^1.8.7 || ^2.0",
 		"mezzio/mezzio": "^3.0"
 	},
 	"require-dev": {