BUGFIX: Drop use of E_STRICT to fix PHP 8.4 deprecation

The use of `E_STRICT` is deprecated as of PHP 8.4, so this fixes
deprecation warnings. Furthermore, the constant is no longer useful…

In PHP 5.4, the functionality of `E_STRICT` was incorporated into
`E_ALL`, meaning strict standards notices are included in the `E_ALL`
error level. As a result, there is no need to use `E_STRICT` separately
starting with PHP 5.4. This change is documented in the PHP manual
under the migration guide for PHP 7.0, which states:

> All of the E_STRICT notices have been reclassified to other levels.
> The E_STRICT constant is retained, so calls like
> `error_reporting(E_ALL|E_STRICT)` will not cause an error.

(see https://www.php.net/manual/en/migration70.incompatible)

Author: kdambekalns

Neos.Flow/Classes/Error/ErrorHandler.php

@@ -72,7 +72,6 @@ public function handleError(int $errorLevel, string $errorMessage, string $error
             E_USER_ERROR         => 'User Error',
             E_USER_WARNING       => 'User Warning',
             E_USER_NOTICE        => 'User Notice',
-            E_STRICT             => 'Runtime Notice',
             E_RECOVERABLE_ERROR  => 'Catchable Fatal Error'
         ];
 

Neos.Flow/Configuration/Development/Settings.yaml

@@ -29,7 +29,7 @@ Neos:
               logException: true
 
       errorHandler:
-        exceptionalErrors: ['%E_USER_ERROR%', '%E_RECOVERABLE_ERROR%', '%E_WARNING%', '%E_NOTICE%', '%E_USER_WARNING%', '%E_USER_NOTICE%', '%E_STRICT%']
+        exceptionalErrors: ['%E_USER_ERROR%', '%E_RECOVERABLE_ERROR%', '%E_WARNING%', '%E_NOTICE%', '%E_USER_WARNING%', '%E_USER_NOTICE%']
 
     log:
       psr3:

Neos.Flow/Configuration/Testing/Settings.yaml

@@ -20,7 +20,7 @@ Neos:
       exceptionHandler:
         className: 'Neos\Flow\Error\DebugExceptionHandler'
       errorHandler:
-        exceptionalErrors: ['%E_USER_ERROR%', '%E_RECOVERABLE_ERROR%', '%E_WARNING%', '%E_NOTICE%', '%E_USER_WARNING%', '%E_USER_NOTICE%', '%E_STRICT%']
+        exceptionalErrors: ['%E_USER_ERROR%', '%E_RECOVERABLE_ERROR%', '%E_WARNING%', '%E_NOTICE%', '%E_USER_WARNING%', '%E_USER_NOTICE%']
 
     log:
       psr3: