Add allow-list config option to securitychecker_enlightn

[peterjaap]

Q	A
Branch	master for features and deprecations
Bug fix?	no
New feature?	yes
BC breaks?	no
Deprecations?	no
Documented?	yes
Fixed tickets	https://github.com/phpro/grumphp/discussions/1037

Add allow-list config option to be able to ignore given vulns, see https://github.com/enlightn/security-checker#allow-vulnerabilities

[peterjaap]

Needs some work, I'll get back to this.

[peterjaap]

@veewee done! :partying_face:

[veewee]

@peterjaap It's a nice feature... Care to finish up this PR? :)

[peterjaap]

@veewee sure, but I've asked you some questions in the comments

[veewee]

@veewee sure, but I've asked you some questions in the comments

@peterjaap Is it possible you made those comments as part of a code review but did not submit those comments? I am not seeing any.

[peterjaap]

@veewee woops, you're right :see_no_evil: Almost a year ago, lol.