only test PHP 7.4 and suggest to use PHP 7.4

Author: Gummibeer

.github/workflows/run-tests.yml

@@ -15,7 +15,7 @@ jobs:
     strategy:
       fail-fast: true
       matrix:
-        php: [7.1, 7.2, 7.3, 7.4]
+        php: [7.4]
         dependency-version: [prefer-lowest, prefer-stable]
 
     name: P${{ matrix.php }} - ${{ matrix.dependency-version }}

composer.json

@@ -19,8 +19,11 @@
         "astrotomic/php-conditional-proxy": "^0.2.0"
     },
     "require-dev": {
-        "pestphp/pest": "^0.1.5",
-        "spatie/pest-plugin-snapshots": "^0.1.0"
+        "pestphp/pest": "^0.3.0",
+        "spatie/pest-plugin-snapshots": "^0.3.0"
+    },
+    "suggest": {
+        "php": "^7.4"
     },
     "config": {
         "sort-packages": true