Tests: Shell: Fix race condition when evaluating multiple statements … #775

Job	Run time
build-linux (ubuntu-22.04, 3.8)	3m 32s
build-macos (macos-latest, 3.8)	12m 19s
build-linux (ubuntu-22.04, 3.9)	3m 46s
build-windows (windows-2019, 3.8)	12m 41s
build-macos (macos-latest, 3.9)	10m 59s
build-windows (windows-2019, 3.9)	11m 12s
build-windows (windows-latest, 3.8)	17m 54s
build-windows (windows-latest, 3.9)	17m 57s
	1h 30m 20s

Provide feedback