www/nginx: Update 3rd party Module NJS

Update the NJS Modile to 0.7.6:
Notable new features:
 - improved r.args:
    Now, duplicate keys are returned as an array, keys are
    case-sensitive, both keys and values are percent-decoded.

    For example, the query string

    'a=1&b=%32&A=3&b=4&B=two%20words'

    is converted to r.args as:

    {a: "1", b: ["2", "4"], A: "3", B: "two words"}

    Changes with njs 0.7.6                                    19 Jul 2022

    nginx modules:

    *) Feature: improved r.args object. Added support for multiple
       arguments with the same key. Added case sensitivity for
       keys. Keys and values are percent-decoded now.

    *) Bugfix: fixed r.headersOut setter for special headers.

    Core:

    *) Feature: added Symbol.for() and Symbol.keyfor().

    *) Feature: added btoa() and atob() from WHATWG spec.

    *) Bugfix: fixed large non-decimal literals.

    *) Bugfix: fixed unicode argument trimming in parseInt().

    *) Bugfix: fixed break instruction in a try-catch block.

    *) Bugfix: fixed async function declaration in CLI.

Sponsored by:	Netzkommune GmbH