Include latest RuboCop channels in engines.yml

• uname -a: Linux nero.lab.netsplit.uk 5.18.10-arch1-1 #1 SMP PREEMPT_DYNAMIC Thu, 07 Jul 2022 17:18:13 +0000 x86_64 GNU/Linux

• docker version:

Client:
 Version:           20.10.17
 API version:       1.41
 Go version:        go1.18.3
 Git commit:        100c70180f
 Built:             Sat Jun 11 23:27:28 2022
 OS/Arch:           linux/amd64
 Context:           default
 Experimental:      true

Server:
 Engine:
  Version:          20.10.17
  API version:      1.41 (minimum version 1.12)
  Go version:       go1.18.3
  Git commit:       a89b84221c
  Built:            Sat Jun 11 23:27:14 2022
  OS/Arch:          linux/amd64
  Experimental:     false
 containerd:
  Version:          v1.6.6
  GitCommit:        10c12954828e7c7c9b6e0ea9b0c02b01407d3ae1.m
 runc:
  Version:          1.1.3
  GitCommit:        
 docker-init:
  Version:          0.19.0
  GitCommit:        de40ad0

• env | grep "^DOCKER_"

<no output>

Recently, some newer versions of the RuboCop engine were pushed to Docker Hub.

These are not yet included in config/engines.yml.

It seems that the following need adding:

• 1.30.0
• 1.31.0

I'll submit a pull request in a few minutes.

I've made what I think are the required changes in #1055. Tested working locally.