test: ensure consistent Julia environments in live job tests #171

Job	Run time
Aqua	1m 9s
Julia 1.6 - ubuntu-latest - pull_request	1m 47s
Julia 1.8 - ubuntu-latest - pull_request	1m 46s
Julia 1.9 - ubuntu-latest - pull_request	1m 37s
Documentation	2m 53s
JET	3m 10s
Julia nightly - ubuntu-latest - pull_request	2m 17s
Julia 1 - windows-latest - pull_request	2m 53s
Julia 1 - macos-latest - pull_request	1m 54s
Doctest	2m 48s
	22m 14s

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