chore(deps): ignore https://github.com/advisories/GHSA-72xf-g2v4-qvf3 (tough-cookie)

[rpl]

This PR adds tough-cookie (transitive dependency got through sign-addon -> request -> tough-cookie) to the nsprc file.

[rpl]

@willdurand would you mind to update #2678 description to mention the updated output?
given that both the nsprc exception are coming from request I think we can track both from the existing issue.

The updated output of npm run audit-deps without the two exceptions is included inside the collapsible details below.

❯ npm run audit-deps

> web-ext@7.6.0 audit-deps
> node ./scripts/audit-deps


== audit-deps: blocking security issues

request (isDirect: false, severity: moderate, fixAvailable: false):
  https://github.com/advisories/GHSA-p8p7-x288-28g6
    request <=2.88.2
    Server-Side Request Forgery in Request
  https://github.com/advisories/GHSA-72xf-g2v4-qvf3
    tough-cookie <4.1.3
    tough-cookie Prototype Pollution vulnerability
sign-addon (isDirect: true, severity: moderate, fixAvailable: false):
  https://github.com/advisories/GHSA-p8p7-x288-28g6
    request <=2.88.2
    Server-Side Request Forgery in Request
  https://github.com/advisories/GHSA-72xf-g2v4-qvf3
    tough-cookie <4.1.3
    tough-cookie Prototype Pollution vulnerability
tough-cookie (isDirect: false, severity: moderate, fixAvailable: false):
  https://github.com/advisories/GHSA-72xf-g2v4-qvf3
    tough-cookie <4.1.3
    tough-cookie Prototype Pollution vulnerability

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (02b483c) 99.53% compared to head (ba278fb) 99.53%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2822   +/-   ##
=======================================
  Coverage   99.53%   99.53%           
=======================================
  Files          32       32           
  Lines        1735     1735           
=======================================
  Hits         1727     1727           
  Misses          8        8           

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