feat: php 8.3, phpunit 11 (#57)

* Upgrade runner php to 8.3, phpunit to 11
* Fix tests, tweaked the code, added missing ext- to composer.json
* Fix exception related code smells

.editorconfig

@@ -0,0 +1,11 @@
+# EditorConfig is awesome: https://EditorConfig.org
+
+# top-most EditorConfig file
+root = true
+
+# Unix-style newlines with a newline ending every file
+[*]
+end_of_line = lf
+insert_final_newline = true
+indent_style = space
+indent_size = 4