test: remove `common.PORT` from gc tests
Checklist
-
tests and code linting passes -
the commit message follows commit guidelines
Affected core subsystem(s)
test
Description of change
Allow the operating system to provide an arbitrary available port rather
than using common.PORT
, as common.PORT
makes it likely that a test
will fail with EADDRINUSE
as a side effect of an earlier test.
R=@mscdex