Fix Deprecated function: Creation of dynamic property in VarbaseMediaHeaderBlock under PHP 8.2+

Problem/Motivation

The creation of dynamic properties is deprecated in PHP 8.2

Steps to reproduce

Deprecated function: Creation of dynamic property Drupal\varbase_media_header\Plugin\Block\VarbaseMediaHeaderBlock::$requestStack is deprecated in Drupal\varbase_media_header\Plugin\Block\VarbaseMediaHeaderBlock->__construct() (line 164 of modules/contrib/varbase_media_header/src/Plugin/Block/VarbaseMediaHeaderBlock.php).

Deprecated function: Creation of dynamic property Drupal\varbase_media_header\Plugin\Block\VarbaseMediaHeaderBlock::$blockManager is deprecated in Drupal\varbase_media_header\Plugin\Block\VarbaseMediaHeaderBlock->__construct() (line 166 of modules/contrib/varbase_media_header/src/Plugin/Block/VarbaseMediaHeaderBlock.php).

Deprecated function: Creation of dynamic property 
Drupal\varbase_media_header\Plugin\Block\VarbaseMediaHeaderBlock::$renderer is deprecated in Drupal\varbase_media_header\Plugin\Block\VarbaseMediaHeaderBlock->__construct() (line 167 of modules/contrib/varbase_media_header/src/Plugin/Block/VarbaseMediaHeaderBlock.php).

Deprecated function: Creation of dynamic property Drupal\varbase_media_header\Plugin\Block\VarbaseMediaHeaderBlock::$entityFieldManager is deprecated in Drupal\varbase_media_header\Plugin\Block\VarbaseMediaHeaderBlock->__construct() (line 168 of modules/contrib/varbase_media_header/src/Plugin/Block/VarbaseMediaHeaderBlock.php).

Proposed resolution

Add the protected properties in VarbaseMediaHeaderBlock.php

Remaining tasks

• ✅ File an issue about this project
• ✅ Addition/Change/Update/Fix to this project
• ✅ Testing to ensure no regression
• ➖ Automated unit/functional testing coverage
• ➖ Developer Documentation support on feature change/addition
• ➖ User Guide Documentation support on feature change/addition
• ➖ UX/UI designer responsibilities
• ➖ Accessibility and Readability
• ✅ Code review from 1 Varbase core team member
• ✅ Full testing and approval
• ✅ Credit contributors
• ✅ Review with the product owner
• ✅ Update Release Notes and Update Helper on new feature change/addition
• ✅ Release varbase-10.0.0-rc2, varbase-9.0.18, varbase_media_header-9.0.10, Varbase 9.1.1, varbase_media_header-9.1.2, varbase_media_header-10.0.0-beta4

Varbase update type

• ✅ No Update
• ➖ Optional Update
• ➖ Forced Update
• ➖ Forced Update if Unchanged

User interface changes

• N/A

API changes

• N/A

Data model changes

• N/A

Release notes snippet

• Issue #3411198 by Ahmad Khader: Fixed Deprecated function: Creation of dynamic property in VarbaseMediaHeaderBlock under PHP 8.2+