NEWS: update for PHP 8.5.0RC5, fix next release

Copy the NEWS entries from the RC5 tag with the changes included there. One of
those entries was already listed in the section for the next release from
PHP-8.5; remove it from that section. Also update the header at the top for
what release is next - the next release from the PHP-8.5 branch is going to be
PHP 8.5.1.

[skip ci]

NEWS

@@ -1,13 +1,11 @@
 PHP                                                                        NEWS
 |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
-?? ??? ????, PHP 8.5.0
+?? ??? ????, PHP 8.5.1
 
 - Core:
   . Sync all boost.context files with release 1.86.0. (mvorisek)
   . Fixed bug GH-20435 (SensitiveParameter doesn't work for named argument
     passing to variadic parameter). (ndossche)
-  . Fixed bug GH-17951 (memory_limit is not always limited by max_memory_limit).
-    (manuelm)
 
 - DOM:
   . Fix memory leak when edge case is hit when registering xpath callback.
@@ -28,6 +26,22 @@ PHP                                                                        NEWS
   . Fixed bug GH-20439 (xml_set_default_handler() does not properly handle
     special characters in attributes when passing data to callback). (ndossche)
 
+13 Nov 2025, PHP 8.5.0RC5
+
+- Core:
+  . Fixed bug GH-17951 (memory_limit is not always limited by max_memory_limit).
+    (manuelm)
+  . Address bug GH-20384 (Confirm if ob_gzhandler is impacted by ob_start
+    handler changes) by reverting GH-18932 (Deprecate returning non-string
+    values from a user output handler). (DanielEScherzer)
+
+- URI:
+  . Fixed bug GH-20431 (Uri\Rfc3986\Uri::setHost(null) turns empty path into /)
+    by updating to a newer uriparser snapshot. (timwolla)
+  . Fixed the distinction between an empty and a missing query/fragment
+    when using Uri\WhatWg\Url::getQuery() and Uri\WhatWg\Url::getFragment().
+    (kocsismate)
+
 06 Nov 2025, PHP 8.5.0RC4
 
 - Core: