testing/singularity: upgrade to 3.5.3

Ref https://github.com/sylabs/singularity/releases
7 jobs for !4257 with singularity in 3 minutes and 31 seconds
detached
Status Job ID Name Coverage
  Lint
passed #52384
docker-alpine x86_64
lint

00:00:32

 
  Build
passed #52389
docker-alpine ci-build aarch64
build-aarch64

00:02:57

passed #52390
docker-alpine ci-build armv7
build-armv7

00:02:48

passed #52388
docker-alpine ci-build ppc64le
build-ppc64le

00:02:13

passed #52387
docker-alpine ci-build s390x
build-s390x

00:02:50

passed #52386
docker-alpine ci-build x86
build-x86

00:01:31

passed #52385
docker-alpine ci-build x86_64
build-x86_64

00:01:30