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GHA: fix shellcheck SC2046 (#411) #105

Job	Run time
Linux (default, valgrind, test-memory)	3m 1s
Linux (clang sanitizers, clang, test, clang, -fsanitize=address,undefined,signed-integer-overflow...	49s
Cygwin	1m 55s
macOS	22s
Windows	45s
	6m 52s

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