Checkstyle and PMD upgrade

[fabriciofx]

The latest version of Checkstyle is 8.15 and PMD is 6.10.0. So, let's update them.

[0crat]

@krzyk/z please, pay attention to this issue

[0crat]

@fabriciofx/z this project will fix the problem faster if you donate a few dollars to it; just click here and pay via Stripe, it's very fast, convenient and appreciated; thanks a lot!

[krzyk]

@fabriciofx please update the description/title to do upgrade of both Checkstyle and PMD.

[fabriciofx]

@krzyk Done.

[krzyk]

@0crat in

[0crat]

@0crat in (here)

@krzyk Job #961 is now in scope, role is DEV

[0crat]

Bug was reported, see §29: +15 point(s) just awarded to @fabriciofx/z

[krzyk]

@0crat assign me

[0crat]

@0crat assign me (here)

@krzyk The job #961 assigned to @krzyk/z, here is why; the budget is 30 minutes, see §4; please, read §8 and §9; if the task is not clear, read this and this; there will be no monetary reward for this job

[0crat]

Manual assignment of issues is discouraged, see §19: -5 point(s) just awarded to @krzyk/z

[krzyk]

@fabriciofx checkstyle and PMD have been upgraded in #968, please close this issue

[fabriciofx]

Closed by #968.

[0crat]

Job was finished in 5 hours, bonus for fast delivery is possible (see §36)

[0crat]

The job #961 is now out of scope

[0crat]

Order was finished: +35 point(s) just awarded to @krzyk/z