Merge pull request #174295 from etu/php-default-to-php81

php: Upgrade from PHP 8.0 to 8.1 as default PHP

nixos/doc/manual/from_md/release-notes/rl-2211.section.xml

···
       In addition to numerous new and upgraded packages, this release
       has the following highlights:
     </para>
-    <itemizedlist spacing="compact">
+    <itemizedlist>
       <listitem>
         <para>
           During cross-compilation, tests are now executed if the test
···
           built for <literal>stdenv.hostPlatform</literal> (i.e.
           produced by <literal>stdenv.cc</literal>) by evaluating
           <literal>stdenv.buildPlatform.canExecute stdenv.hostPlatform</literal>.
+        </para>
+      </listitem>
+      <listitem>
+        <para>
+          PHP now defaults to PHP 8.1, updated from 8.0.
         </para>
       </listitem>
     </itemizedlist>

nixos/doc/manual/release-notes/rl-2211.section.md

···
   built for `stdenv.hostPlatform` (i.e. produced by `stdenv.cc`) by evaluating
   `stdenv.buildPlatform.canExecute stdenv.hostPlatform`.
 
+- PHP now defaults to PHP 8.1, updated from 8.0.
+
 <!-- To avoid merge conflicts, consider adding your item at an arbitrary place in the list instead. -->
 
 ## New Services {#sec-release-22.11-new-services}

pkgs/top-level/all-packages.nix

···
   # PHP interpreters, packages and extensions.
   #
   # Set default PHP interpreter, extensions and packages
-  php = php80;
+  php = php81;
   phpExtensions = php.extensions;
   phpPackages = php.packages;