ci: fix pidiff since introduction of pubtools dep #106
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A dependency of (pubtools-pulplib => pubtools) was recently
introduced.
This appears to break pidiff's handling of this library. Previously, in
a venv with pubtools-pulplib installed, "pubtools" would be the root
module for pubtools-pulplib code (only). Now it is the root namespace
sharing code for both "pubtools-pulplib" and "pubtools", and pidiff
can't automatically tell the difference.
It can be fixed by explicitly telling the tool which module should be
checked.
{posargs} were also added so that one can run e.g.
"tox -e pidiff -- -vv" for debugging purposes.