www/nginx-devel: update NGINX JavaScript module to 0.7.4

Bump PORTREVISION.

<ChangeLog>
nginx modules:

*) Feature: added extended directive to configure Fetch API.
   The following directives were added: "js_fetch_timeout",
   "js_fetch_verify", "js_fetch_buffer_size",
   "js_fetch_max_response_buffer_size".

*) Change: r.internalRedirect() now accepts escaped URIs.

*) Bugfix: fixed Response parsing with more than 8 headers
   in Fetch API.

Core:

*) Feature: added njs.version_number property.

*) Feature: added compatibility with BoringSSL for
   WebCrypto API.

*) Bugfix: fixed Array.prototype.sort() when arr size is changed
   in a comparator.

*) Bugfix: fixed Array.prototype.slice() with slow "this" argument.

*) Bugfix: fixed aggregation methods of Promise ctor with
   array-like object.

*) Bugfix: fixed Array.prototype.lastIndexOf() with unicode
   string as "this".

*) Bugfix: fixed JSON.parse() when reviver function is provided.

*) Bugfix: fixed Object.defineProperty() when a recursive descriptor
   is provided.

*) Bugfix: fixed Array.prototype.fill() for typed-arrays.

*) Bugfix: making function expression binding immutable according
   the specs.

*) Bugfix: fixed redefinition of special props in
   Object.defineProperty().

</ChangeLog>