External Libraries: Backport upstream PHP 8.5 fixes for SimplePie.

After the update to v1.9.0 in [60771], this merges a single bug fix, in absence of a new upstream release in time for 6.9 Beta.

References:

* [https://github.com/simplepie/simplepie/pull/949 Original upstream PR]

Props swissspidy.
Fixes #63961.
Built from https://develop.svn.wordpress.org/trunk@60947


git-svn-id: http://core.svn.wordpress.org/trunk@60283 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/SimplePie/src/IRI.php

@@ -170,7 +170,7 @@ class IRI
             $return = null;
         }
 
-        if ($return === null && isset($this->normalization[$this->scheme][$name])) {
+        if ($return === null && isset($this->scheme, $this->normalization[$this->scheme][$name])) {
             return $this->normalization[$this->scheme][$name];
         }
 
@@ -623,6 +623,10 @@ class IRI
      */
     protected function scheme_normalization()
     {
+        if ($this->scheme === null) {
+            return;
+        }
+
         if (isset($this->normalization[$this->scheme]['iuserinfo']) && $this->iuserinfo === $this->normalization[$this->scheme]['iuserinfo']) {
             $this->iuserinfo = null;
         }

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.9-alpha-60946';
+$wp_version = '6.9-alpha-60947';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.