fix installation of ReFrame 4.2.0 (include `hpctestlib`) in EESSI pilot 2023.06 #322

Job	Run time
eessi_container_script (help)	1m 42s
eessi_container_script (listrepos_default)	1m 19s
eessi_container_script (listrepos_custom)	1m 19s
eessi_container_script (run)	3m 20s
eessi_container_script (shell)	3m 23s
eessi_container_script (container)	2m 47s
eessi_container_script (resume)	3m 46s
	17m 36s

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