Bump github.com/stretchr/testify from 1.8.4 to 1.9.0 #919

Job	Run time
Build nikos	43s
Check GLIBC references	6s
Molecule tests (fedora, host)	24m 33s
Molecule tests (fedora, container)	26m 4s
Molecule tests (centos, host)	7m 23s
Molecule tests (centos, container)	26m 11s
Molecule tests (opensuse, host)	25m 45s
Molecule tests (opensuse, container)	22m 53s
Molecule tests (debian, host)	21m 30s
Molecule tests (debian, container)	24m 34s
Molecule tests (ubuntu, host)	20m 40s
Molecule tests (ubuntu, container)	21m 13s
Molecule tests (oracle, host)	3m 3s
Molecule tests (oracle, container)	3m 14s
Molecule tests (amazon-linux, host)	20m 44s
Molecule tests (amazon-linux, container)	22m 42s
	4h 31m 18s

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