fix: php 8.4 deprecation (#30)

* fix: php 8.4 deprecation

* ci: add php 8.4

Author: shyim

.github/workflows/ci.yml

@@ -20,7 +20,7 @@ jobs:
 
     steps:
     - name: Checkout
-      uses: actions/checkout@v2
+      uses: actions/checkout@v4
 
     - name: Setup PHP
       uses: shivammathur/setup-php@v2
@@ -39,11 +39,11 @@ jobs:
     strategy:
       fail-fast: true
       matrix:
-        php-versions: ['8.1', '8.2', '8.3']
+        php-versions: ['8.1', '8.2', '8.3', '8.4']
 
     steps:
     - name: Checkout
-      uses: actions/checkout@v2
+      uses: actions/checkout@v4
 
     - name: Setup PHP
       uses: shivammathur/setup-php@v2

src/Rize/UriTemplate.php

@@ -17,7 +17,7 @@ class UriTemplate
               $base_uri,
               $params = array();
 
-    public function __construct($base_uri = '', $params = array(), Parser $parser = null)
+    public function __construct($base_uri = '', $params = array(), ?Parser $parser = null)
     {
         $this->base_uri = $base_uri;
         $this->params   = $params;