Change `Pervasives` to `Stdlib` to make the source compatible with OC… #250

Job	Run time
Build TLAPS installer and test it (macos-latest, 0)	9m 6s
Build TLAPS installer and test it (macos-latest, 1)	9m 4s
Build TLAPS installer and test it (macos-latest, 2)	8m 42s
Build TLAPS installer and test it (ubuntu-latest, 0)	5m 3s
Build TLAPS installer and test it (ubuntu-latest, 1)	4m 49s
Build TLAPS installer and test it (ubuntu-latest, 2)	9m 6s
	45m 50s

Provide feedback