python3-pytest-mock: Fix ptests

- Drop the patch to add additional checks to disable failing introspection
  tests, use plain asserts instead

- Switch to pypi fetcher

- Add missing rdeps needed for ptest runs

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Cc: Trevor Gamblin <tgamblin@baylibre.com>
Signed-off-by: Armin Kuster <akuster808@gmail.com>

meta-python/recipes-devtools/python/python3-pytest-mock/run-ptest

@@ -1,3 +1,3 @@
 #!/bin/sh
-
-pytest --automake
+# see https://github.com/pytest-dev/pytest-mock/issues/102 for reasons to use plain asserts
+pytest --automake --assert=plain