Update phst_update_workspace_snippets digest to ef013b9 #3599

Job	Run time
Test (7.2.1, ubuntu-latest, gcc)	2m 12s
Test (7.2.1, ubuntu-latest, clang)	2m 12s
Test (7.2.1, macos-latest, clang)	2m 28s
Test (7.2.1, windows-latest, msvc)	4m 37s
Test (7.4.1, ubuntu-latest, gcc)	2m 10s
Test (7.4.1, ubuntu-latest, clang)	2m 6s
Test (7.4.1, macos-latest, clang)	2m 30s
Test (7.4.1, windows-latest, msvc)	5m 33s
Test (8.0.1, ubuntu-latest, gcc)	1m 58s
Test (8.0.1, ubuntu-latest, clang)	1m 51s
Test (8.0.1, macos-latest, clang)	3m 4s
Test (8.0.1, windows-latest, msvc)	3m 42s
Test (latest, ubuntu-latest, gcc)	2m 5s
Test (latest, ubuntu-latest, clang)	1m 51s
Test (latest, macos-latest, clang)	3m 7s
Test (latest, windows-latest, msvc)	3m 50s
	45m 16s

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