www/nginx: update third-party spnego-http-auth module

There was an error when loading the module in nginx.conf. This update also fixes this error:
nginx: [emerg] dlopen() "/usr/local/libexec/nginx/ngx_http_auth_spnego_module.so" failed (/usr/local/libexec/nginx/ngx_http_auth_spnego_module.so: Undefined symbol "__gss_krb5_mechanism_oid_desc") in /usr/local/etc/nginx/nginx.conf:7
nginx: configuration file /usr/local/etc/nginx/nginx.conf test failed

PR: 261810
Sponsored by: Netzkommune GmbH