fix: create install directory with mkdir -p

[vespian]

Summary

Issue with jq pluging being moved showed an issue in asdf itself - an empty download dir can be created:

dev@pr-mr-test:~/$ tree /home/dev/.asdf/downloads/
/home/dev/.asdf/downloads/
├── jq
│   └── 1.6

This was causing asdf to fail with cryptic message:

mkdir: cannot create directory ‘/home/dev/.asdf/downloads/jq/1.6’: File exists

This MR fixes that.

[hyperupcall]

LGTM! Surprised that this flag wasn't already present.

(waiting on someone else with merging permissions to merge)

[jthegedus]

I too am surprised this wasn't already present, thanks!

@hyperupcall I appreciate your reviews, really gives myself & @Stratus3D more confidence having more eyes on this. We've both been busy recently so this helps greatly! 🙏

[zoeytruong]

Thank you for fixing this. Can this merged PR go into the next release? The current release v.0.11.3 does not have this fix. I will really appreciate your help.

[hyperupcall]

@zoeytruong Yes! It's not in v0.11.3, but it's slated for inclusion in v0.12.0. The only issue that's really blocking the release is #1550, but #1560 should be merged relatively soon. Once it's merged I think the asdf team will make their next release