testing/xmrig: upgrade to 5.6.0

Ref https://github.com/xmrig/xmrig/releases
7 jobs for !4133 with xmrig in 2 minutes and 13 seconds
detached
Status Job ID Name Coverage
  Lint
passed #50638
x86_64 docker-alpine
lint

00:00:38

 
  Build
passed #50643
aarch64 ci-build docker-alpine
build-aarch64

00:00:26

passed #50644
armv7 ci-build docker-alpine
build-armv7

00:01:33

passed #50642
ppc64le ci-build docker-alpine
build-ppc64le

00:00:52

passed #50641
s390x ci-build docker-alpine
build-s390x

00:00:26

passed #50640
x86 ci-build docker-alpine
build-x86

00:01:17

passed #50639
x86_64 ci-build docker-alpine
build-x86_64

00:01:09