Fix deflate responses not being decompressed

[iOnline247]

I think this should be deflate.

Checklist

• I have read the documentation.
• I have included a pull request description of my changes.
• I have included some tests.
• If it's a new feature, I have included documentation updates in both the README and the types.

[szmarczak]

Thanks, this is an important fix! Can you add a test please?

[iOnline247]

Admittedly, I'm new to the code base. Was just reading through and noticed an odd magic string. Is there an example test that would be a good boilerplate to follow? I'm guessing this one would be a good starting point.

https://github.com/sindresorhus/got/blob/main/test/promise.ts#L33-L41

[dynamiclover]

This should be merged as a fix.

Reasoning:
There's no test coverage currently for deflate or it would have caught the typo.

The CI failures seem spurious/unrelated to this change.