CLSA-2023-1696536930 httpd: Fix of 4 CVEs

CVE-2021-26690: Fix NULL pointer dereference in modsession - CVE-2022-22719: Fix possible process crash due to unnoticed failures in modlua - CVE-2022-29404: Fix possible DoS due to no default limit on possible input size in modlua - CVE-2022-26377: Fix possible HTTP request smuggling in...