Replace slim/psr7 by nyholm/psr7

Maybe this will be temporary, but we can not stop because the vendor does not reply.
It's been two weeks.

Ref: https://github.com/slimphp/Slim-Psr7/issues/284

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

composer.json

@@ -58,6 +58,7 @@
         "composer/ca-bundle": "^1.2",
         "google/recaptcha": "^1.1",
         "nikic/fast-route": "^1.3",
+        "nyholm/psr7": "^1.8",
         "paragonie/sodium_compat": "^1.17",
         "phpmyadmin/motranslator": "^5.0",
         "phpmyadmin/shapefile": "^3.0.1",
@@ -65,7 +66,6 @@
         "phpmyadmin/twig-i18n-extension": "^4.0",
         "psr/http-factory": "^1.0",
         "psr/http-message": "^1.0",
-        "slim/psr7": "^1.4",
         "symfony/config": "^5.2.3",
         "symfony/dependency-injection": "^5.2.3",
         "symfony/expression-language": "^5.2.3",