Fix memory unit in germlinecnvcaller modules

[ramprasadn]

PR checklist

Closes #XXX

• This comment contains a description of changes (with reason).
• If you've fixed a bug or added code that should be tested, add tests!
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[ramprasadn]

Not sure why the two CI tests failed, because they work just fine on my laptop. I am considering if this could be related to disk space problems, so I have included a disk cleanup step to investigate further. Let's see....

[ramprasadn]

Okay.. I am starting to think that these failures have nothing to do with my change, as even the current version doesn't seem to work on github CI anymore.

[ramprasadn]

@maxulysse what do you think about this one?

[maxulysse]

by passing the failing tests