As of 2022-06-23, the Hetzner DNS API is still responding with a 422
when a CAA record contains a quoted value with spaces.
```
format: number of fields does not match record type, expecting 3
```
Their support acknowledged my bug report a few weeks back and suggested
the removal of spaces to get past the limitation.
Spaces in CAA records are not common. Let's just skip the test and put
a notice in the docs.
Signed-off-by: Jakob Ackermann <das7pad@outlook.com>
9ea125289b