Update dependency phpunit/phpunit to v9 (#46)

* Require min 7.3

* Update dependency phpunit/phpunit to v9

* Bump supported php versions

Co-authored-by: Rasmus Bengtsson <2124386+rasmusbe@users.noreply.github.com>
Co-authored-by: Renovate Bot <bot@renovateapp.com>

.github/workflows/php.yml

@@ -13,11 +13,8 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        php-version: ['7.2', '7.3', '7.4']
+        php-version: ['7.3', '7.4', '8.0']
         test-command: ['test']
-        include:
-          - php-version: '8.0'
-            test-command: 'unittest'
 
     name: Test PHP ${{ matrix.php-version }}
     steps:

composer.json

@@ -30,13 +30,13 @@
     "issues": "https://github.com/personnummer/php/issues"
   },
   "require": {
-    "php": ">=7.2"
+    "php": ">=7.3"
   },
   "require-dev": {
     "ext-json": "*",
     "squizlabs/php_codesniffer": "^3.4",
     "jchook/phpunit-assert-throws": "^1.0",
-    "phpunit/phpunit": "^8.5",
+    "phpunit/phpunit": "^9.0",
     "phpcompatibility/php-compatibility": "^9.3",
     "dealerdirect/phpcodesniffer-composer-installer": "^0.7.0",
     "roave/security-advisories": "dev-master"
@@ -61,7 +61,7 @@
   },
   "config": {
     "platform": {
-      "php": "7.2"
+      "php": "7.3"
     }
   }
 }