PHP 8.3 support (#610)

* added PHP 8.3 to test pipeline

* Update Encoding.php

* Update EncodingTest.php

Author: k00ni

.github/workflows/continuous-integration.yml

@@ -23,6 +23,7 @@ jobs:
           - "8.0"
           - "8.1"
           - "8.2"
+          - "8.3"
 
     steps:
       - name: "Checkout"
@@ -153,6 +154,7 @@ jobs:
           - "8.0"
           - "8.1"
           - "8.2"
+          - "8.3"
 
     steps:
       - name: "Checkout"
@@ -207,7 +209,7 @@ jobs:
     strategy:
       fail-fast: true
       matrix:
-        php-versions: ['7.1', '7.2', '7.3', '7.4', '8.0', '8.1', '8.2']
+        php-versions: ['7.1', '7.2', '7.3', '7.4', '8.0', '8.1', '8.2', '8.3']
 
     steps:
       - name: Checkout