fix: Install Hugo extended by default

[hrishikesh-k]

Summary

Fixes #182 (again)

It appears that the above error has resurfaced. Internal link: https://github.com/netlify/pillar-support/issues/42

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[hrishikesh-k]

Looks like Hugo Extended doesn't have Linux-ARM64 (anymore). Reverted to standard Hugo for ARM 64

[hrishikesh-k]

Updated the tests!