Cannot fetch array @ 58a7ea

[autotaker]

Hi devs,

I pulled ghc gitlab repository by
```
git pull --recurse-submodules
```

But it failed with the following error.
```
error: Server does not allow request for unadvertised object
58a7ea0336363b29513164487190f6570b8ea834
Fetched in submodule path 'libraries/array', but it did not contain
58a7ea0336363b29513164487190f6570b8ea834. Direct fetching of that commit
failed.
```
It seems the latest commit `58a7ea` of `array` library is not found on the
server.
Are there any help on this?

Best,
Taku Terao
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