gnu: httpd: Update to 2.4.57 [security fixes].
Fixes CVE-2023-27522, CVE-2023-25690, CVE-2022-37436, CVE-2022-36760,
CVE-2006-20001, CVE-2022-31813, CVE-2022-30556, CVE-2022-30522,
CVE-2022-29404, CVE-2022-28615, CVE-2022-28614, CVE-2022-28330,
CVE-2022-26377, CVE-2022-23943, CVE-2022-22721, CVE-2022-22720,
and CVE-2022-22719.
* gnu/packages/web.scm (httpd): Update to 2.4.57.
(httpd/pinned): New variable.
* gnu/packages/gnome.scm (libsoup-minimal): Replace httpd with httpd/pinned.