Drop PHP 7 support

Author: Sander van der Vlugt

.github/workflows/main.yaml

@@ -12,7 +12,7 @@ jobs:
 
     strategy:
       matrix:
-        php-versions: ['7.3', '7.4', '8.0']
+        php-versions: ['8.0', '8.1', '8.2']
     name: PHP ${{ matrix.php-versions }}
     steps:
       -   uses: actions/checkout@v2

composer.json

@@ -5,7 +5,7 @@
     "license":           "MIT",
     "minimum-stability": "stable",
     "require": {
-        "php":                  "^7.3|^8.0",
+        "php":                  "^8.0",
         "composer-plugin-api":  "^2.0",
         "ext-bcmath":           "*",
         "ext-json":             "*",