testing/singularity: upgrade to 3.5.2

- Ref https://github.com/sylabs/singularity/releases/tag/v3.5.2
- Security fix (CVE-2019-19724)
- Enable all archies for builders
7 jobs for !2216 with singularity in 2 minutes and 31 seconds (queued for 1 second)
detached
Status Job ID Name Coverage
  Lint
passed #23944
docker-alpine x86_64
lint

00:00:32

 
  Build
passed #23949
docker-alpine ci-build aarch64
build-aarch64

00:01:26

passed #23950
docker-alpine ci-build armv7
build-armv7

00:01:54

passed #23948
docker-alpine ci-build ppc64le
build-ppc64le

00:01:56

passed #23947
docker-alpine ci-build s390x
build-s390x

00:01:16

passed #23946
docker-alpine ci-build x86
build-x86

00:01:29

passed #23945
docker-alpine ci-build x86_64
build-x86_64

00:01:29