testing/singularity: upgrade to 3.5.1

- Ref https://github.comm/sylabs/singularity/releases/tag/v3.5.1
- Enable all archies
7 jobs for !1909 with singularity in 5 minutes and 35 seconds (queued for 1 second)
detached
Status Job ID Name Coverage
  Lint
passed #20396
docker-alpine x86_64
lint

00:02:51

 
  Build
passed #20401
docker-alpine ci-build aarch64
build-aarch64

00:01:57

passed #20402
docker-alpine ci-build armv7
build-armv7

00:02:44

passed #20400
docker-alpine ci-build ppc64le
build-ppc64le

00:01:41

passed #20399
docker-alpine ci-build s390x
build-s390x

00:01:37

passed #20398
docker-alpine ci-build x86
build-x86

00:01:26

passed #20397
docker-alpine ci-build x86_64
build-x86_64

00:01:24