Avoid dynamic properties creation

PHP 8.2 deprecated the dynamic object creation, by setting unknown properties.

This fixes the following issue:
Creation of dynamic property TheSeer\phpDox\Bootstrap::$api is deprecated

composer.json

@@ -13,7 +13,7 @@
     "issues" : "https://github.com/theseer/phpdox/issues"
   },
   "require" : {
-    "php" : ">=7.1",
+    "php" : ">=7.4",
     "ext-tokenizer" : "*",
     "ext-dom" : "*",
     "ext-xsl" : "*",

lib/fDOMDocument/composer.json

@@ -14,13 +14,10 @@
         "issues": "https://github.com/theseer/fDOMDocument/issues"
     },
     "require": {
-        "php": ">=5.3.3",
+        "php": ">=7.4",
         "ext-dom": "*",
         "lib-libxml": "*"
     },
-    "require-dev": {
-        "php": ">=7.3"
-    },
     "autoload": {
         "classmap": [
             "src/"

src/bootstrap/Bootstrap.php

@@ -2,6 +2,10 @@
 namespace TheSeer\phpDox;
 
 class Bootstrap {
+
+    private ProgressLogger $logger;
+    private BootstrapApi $api;
+
     public function __construct(ProgressLogger $logger, BootstrapApi $api) {
         $this->logger = $logger;
         $this->api    = $api;

src/bootstrap/BootstrapApi.php

@@ -65,6 +65,8 @@ class BootstrapApi {
      */
     private $backends = [];
 
+    private ProgressLogger $logger;
+
     /**
      * Constructor
      */