Merge: php: 8.3 -> 8.4 (#394112)

  NEWS can been viewed from Emacs by typing `C-h n`, or by clicking `Help->Emacs News` from the menu bar.

  It can also be browsed [online](https://git.savannah.gnu.org/cgit/emacs.git/tree/etc/NEWS?h=emacs-30).

- The default PHP version has been updated to 8.3.

- The default PHP version has been updated to 8.4.

- The default Erlang OTP version has been updated to 27.

    systemd.services.selfoss-update = {

      serviceConfig = {

        ExecStart = "${pkgs.php}/bin/php ${dataDir}/cliupdate.php";

        ExecStart = "${pkgs.php83}/bin/php ${dataDir}/cliupdate.php";

        User = "${cfg.user}";

      };

      startAt = "hourly";

  # PHP interpreters, packages and extensions.

  #

  # Set default PHP interpreter, extensions and packages

  php = php83;

  php = php84;

  phpExtensions = php.extensions;

  phpPackages = php.packages;