exec: fix incorrect deps computation for special mounts #5251
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fixes docker/buildx#2479
regression from #4624 (v0.13)
Secret, SSH and Tmpfs mounts never have an input vertex and zero value for input should not be considered an input at index 0 .
Currently, if for example secret mount had a input=0, it caused content based checksum from first input(rootfs), that could take quite a lot of time when image was big and had lots of files. The computation result was cached but if there was a cache invalidation in previous commands it caused checksum to recomputed again for the command with the secret mount.