Fix "Creation of dynamic property" warnings in PHP 8.2

Author: thekid

src/main/php/security/credentials/FromFile.class.php

@@ -5,7 +5,7 @@
 class FromFile extends FromStream {
   const REMOVE = true;
 
-  private $remote= false;
+  private $remove;
 
   /**
    * Uses file as secret storage

src/main/php/security/credentials/FromKeePass.class.php

@@ -6,7 +6,7 @@
 use util\Secret;
 
 class FromKeePass implements Secrets {
-  private $file, $key;
+  private $file, $key, $group;
   private $db= null;
 
   /**

src/test/php/security/credentials/unittest/FromDockerSecretsTest.class.php

@@ -7,6 +7,7 @@
 use util\Secret;
 
 class FromDockerSecretsTest extends AbstractSecretsTest {
+  private $path;
 
   /** @return security.credentials.Secrets */
   protected function newFixture() {