www/nginx-devel: Update to 1.31.3

Changes:

*) Security: heap buffer overflow when using the map directive with

regex matching (CVE-2026-42533)

*) Security: uninitialized memory access when using unnamed regex

captures with the "slice" directive or background cache update
(CVE-2026-60005)

*) Security: use-after-free when processing a specially crafted

proxied backend response with the ngx_http_ssi_filter_module
(CVE-2026-56434)

*) Change: the size of headers and trailers in HTTP/2 responses in

the ngx_http_proxy_v2_module and ngx_http_grpc_module is now
limited with "proxy_buffer_size" and "grpc_buffer_size"

*) Feature: the "xml_external_entities" directive in the

ngx_http_xslt_filter_module; loading of external entities is now
disabled by default

Release Notes: https://nginx.org/en/CHANGES
Security: 56feeac6-8263-11f1-92ba-bc24110523fe
Security: CVE-2026-42533
Security: CVE-2026-56434
Security: CVE-2026-60005

PR: 296830

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