PHP 8.4: Fix E_STRICT deprecation (#34)

* Test against PHP 8.4
* PHP 8.4: Do not use deprecated constant E_STRICT

Author: W0rma

.github/workflows/main.yml

@@ -8,7 +8,7 @@ jobs:
 
     strategy:
       matrix:
-        php: [8.1, 8.2, 8.3]
+        php: [8.1, 8.2, 8.3, 8.4]
         composer_flags: [ '', '--prefer-lowest' ]
 
     steps:

tests/unit.suite.yml

@@ -1,2 +1,2 @@
-error_level: "E_ALL | E_STRICT"
+error_level: "E_ALL"
 class_name: UnitTester