www/nginx-devel: Update to 1.31.4

*) Feature: the "proxy_protocol" directive in the stream and mail

modules now supports the PROXY protocol version 2.

*) Change: now HTTP/2 and gRPC requests to backends are always sent with

the ":authority" pseudo-header, and HTTP/1.1 requests - with the
"Host" header.

*) Bugfix: a segmentation fault might occur in a worker process if the

"select" method was used.

*) Bugfix: incomplete gRPC responses with a non-zero "Content-Length"

header line are now treated as malformed.

*) Bugfix: in binary compatibility with third-party modules using script

codes; the bug had appeared in 1.31.3.

*) Bugfix: in the ngx_http_perl_module.

*) Bugfixes in HTTP/2, HTTP/3, ngx_http_image_filter_module, and

ngx_http_grpc_module.

Changes: https://nginx.org/en/CHANGES

Sponsored by: Netzkommune GmbH