Merge #18585: test: use zero-argument super() shortcut (Python 3.0+)

0956e46bff7f0b6da65a4de6d4f8261fe9d7055c test: use zero-argument super() shortcut (Python 3.0+) (Sebastian Falbesoner)

Pull request description:

  This mini-PR replaces all calls to `super(...)` with arguments with the zero-argument shortcut `super()` where applicable. See [PEP 3135](https://www.python.org/dev/peps/pep-3135/#specification):

  > The new syntax:
  >
  >     super()
  >
  > is equivalent to:
  >
  >     super(__class__, <firstarg>)
  >
  > where __class__ is the class that the method was defined in, and <firstarg> is
  > the first parameter of the method (normally self for instance methods, and cls
  > for class methods).

ACKs for top commit:
  fanquake:
    ACK 0956e46bff7f0b6da65a4de6d4f8261fe9d7055c

Tree-SHA512: 4ac66fe7ab2be2e8a514e5fcfc41dbb298f21b23ebb7b7b0310d704b0b3cef8adf287a8d80346d1ea9418998c597b4f0ff1f66148d0d806bb43db6607e0fe1cf

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