IXR: Replace double and boolean casts with float and bool

PHP 8.5 deprecates non-canonical scalar type casts (boolean|double|integer|binary). Therefore, their canonical versions should be used.

See https://php.watch/versions/8.5/boolean-double-integer-binary-casts-deprecated.

Author: TobiasBg

src/wp-includes/IXR/class-IXR-message.php

@@ -177,7 +177,7 @@ function tag_close($parser, $tag)
                 $valueFlag = true;
                 break;
             case 'double':
-                $value = (double)trim($this->_currentTagContents);
+                $value = (float)trim($this->_currentTagContents);
                 $valueFlag = true;
                 break;
             case 'string':
@@ -196,7 +196,7 @@ function tag_close($parser, $tag)
                 }
                 break;
             case 'boolean':
-                $value = (boolean)trim($this->_currentTagContents);
+                $value = (bool)trim($this->_currentTagContents);
                 $valueFlag = true;
                 break;
             case 'base64':