upgrade to checkstyle 8.18

[romani]

https://checkstyle.org/releasenotes.html#Release_8.18

[romani]

@vorburger , @lkoe ,
security vulnerability checkstyle/checkstyle#6474 become public and now Github do alert on projects that use old version of checkstyle.

is it possible to find time to upgrade eclipse-cs to checkstyle 8.18 ?
Unfortunately https://github.com/sevntu-checkstyle/sevntu.checkstyle depends on eclipse-cs version (historical reason) and this creates alert in Github.

I appreciate your efforts in support of eclipse-cs.

[vorburger]

@romani FYI I don't actually maintain eclipse-cs (only https://github.com/m2e-code-quality/m2e-code-quality), this is one for @lkoe ...

[vorburger]

@Bananeweizen Hallo, I can see in git log that you are active on this project, perhaps you have any interest on engaging on this?

[lkoe]

I'll try catching up with the releases over the weekend

[lkoe]

Alright, I've shelled out 6 consecutive releases 8.13-8.18

Sorry for the long hiatus. If people want to step up, I am open to passing on the keys to the castle...

[Bananeweizen]

Great job, Lars. And sorry, I've also been only sporadically on github.