remove support to php 7.3

Author: cesargb

.github/workflows/tests.yml

@@ -8,7 +8,7 @@ jobs:
         strategy:
             fail-fast: false
             matrix:
-                php: [7.3, 7.4, 8.0]
+                php: [7.4, 8.0]
 
         name: P${{ matrix.php }}
 

composer.json

@@ -16,7 +16,7 @@
     ],
     "license": "MIT",
     "require": {
-        "php": "^7.3 || ^8.0"
+        "php": "^7.4 || ^8.0"
     },
     "autoload": {
         "psr-4": {