Update composer dependencies

Signed-off-by: Raimund Schlüßler <raimund.schluessler@mailbox.org>

.github/workflows/lint.yml

@@ -16,7 +16,7 @@ jobs:
 
     strategy:
       matrix:
-        php-versions: ['7.3', '7.4']
+        php-versions: ['8.0', '8.1']
   
     name: php${{ matrix.php-versions }}
     steps:
@@ -50,7 +50,7 @@ jobs:
       - name: Set up php
         uses: shivammathur/setup-php@v2
         with:
-          php-version: 7.4
+          php-version: 8.0
           coverage: none
       - name: Install dependencies
         run: composer i

composer.json

@@ -9,12 +9,17 @@
             "email": "dev@bernhard-posselt.com"
         }
     ],
-    "require": {},
+    "require": {
+        "php": ">=7.3 <=8.1"
+    },
     "require-dev": {
         "nextcloud/coding-standard": "^0.3.0",
-        "phpunit/phpunit": "^7.5"
+        "phpunit/phpunit": "^9.5"
     },
     "config": {
+        "platform": {
+            "php": "7.4"
+        },
         "optimize-autoloader": true,
         "classmap-authoritative": true
     },