testing/gyp: use python3

7 jobs for !711 with gyp in 58 seconds (queued for 1 second)
detached
Status Job ID Name Coverage
  Lint
passed #7466
docker-alpine x86_64
lint

00:00:23

 
  Build
passed #7471
docker-alpine ci-build aarch64
build-aarch64

00:00:26

passed #7472
docker-alpine ci-build armv7
build-armv7

00:00:30

passed #7470
docker-alpine ci-build ppc64le
build-ppc64le

00:00:32

passed #7469
docker-alpine ci-build s390x
build-s390x

00:00:23

passed #7468
docker-alpine ci-build x86
build-x86

00:00:28

passed #7467
docker-alpine ci-build x86_64
build-x86_64

00:00:32