[9.x] Drop PHP 7.3 (#36038)

GrahamCampbell · web-flow · commit dd5b3aa7dc63 · 2021-01-25T10:20:42.000-06:00
* Drop PHP 7.3

* Update tests.yml
diff --git a/composer.json b/composer.json
@@ -14,7 +14,7 @@
         }
     ],
     "require": {
-        "php": "^7.3|^8.0",
+        "php": "^7.4|^8.0",
         "illuminate/contracts": "^9.0",
         "illuminate/macroable": "^9.0"
     },
