Fix the workflow for PSR-7 libraries

Ref: 3b4b4e287a

Signed-off-by: William Desportes <williamdes@wdes.fr>

.github/workflows/tests.yml

@@ -199,11 +199,9 @@ jobs:
         php-version: ['7.2']
         os: [ubuntu-latest]
         php-extensions: ['mbstring, iconv, mysqli, zip, bz2']
-        psr-7-library: ['guzzlehttp/psr7']
+        psr-7-library: ['guzzlehttp/psr7', 'slim/psr7', 'nyholm/psr7']
         include:
           - {psr-7-library: 'laminas/laminas-diactoros', php-version: '7.4'}
-          # https://github.com/slimphp/Slim-Psr7/issues/284
-          - {psr-7-library: 'slim/psr7', php-version: '7.3'}
     steps:
       - name: Checkout code
         uses: actions/checkout@v3
@@ -230,7 +228,7 @@ jobs:
           dependency-versions: highest
 
       - name: Remove default PSR-7 implementation
-        run: composer remove nyholm/psr7
+        run: composer remove slim/psr7
 
       - name: Add PSR-7 implementation
         run: composer require ${{ matrix.psr-7-library }}