testing/xmrig: upgrade to 6.6.2

Ref https://github.com/xmrig/xmrig/releases/tag/v6.6.2
7 jobs for !15161 with xmrig in 1 minute and 36 seconds (queued for 3 seconds)
detached
Status Job ID Name Coverage
  Lint
passed #259128
docker-alpine x86_64
lint

00:00:22

 
  Build
passed #259133
docker-alpine ci-build aarch64
build-aarch64

00:01:13

passed #259134
docker-alpine ci-build armv7
build-armv7

00:00:34

passed #259132
docker-alpine ci-build ppc64le
build-ppc64le

00:00:47

passed #259131
docker-alpine ci-build s390x
build-s390x

00:00:25

passed #259130
docker-alpine ci-build x86
build-x86

00:01:08

passed #259129
docker-alpine ci-build x86_64
build-x86_64

00:01:01