src/poky:python3-pytest: upgrade 6.2.4 -> 6.2.5

Drop pluggy-1.0 patch; fixed upstream

pytest 6.2.5 (2021-08-29)
  Trivial/Internal Changes
    #8494: Python 3.10 is now supported.
    #9040: Enable compatibility with pluggy 1.0 or later.

References:
  pytest-dev/pytest#8494
  pytest-dev/pytest#9040

(From OE-Core rev: cd83fa054d133eb2b189ad3f0a743cc72001e064)

Signed-off-by: Tim Orling <timothy.t.orling@intel.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>