doc: fix EncodingWarnings in examples (#11158)

Otherwise the warnings show in the regen output.

doc/en/example/nonpython/conftest.py

@@ -12,7 +12,7 @@ class YamlFile(pytest.File):
         # We need a yaml parser, e.g. PyYAML.
         import yaml
 
-        raw = yaml.safe_load(self.path.open())
+        raw = yaml.safe_load(self.path.open(encoding="utf-8"))
         for name, spec in sorted(raw.items()):
             yield YamlItem.from_parent(self, name=name, spec=spec)
 

doc/en/example/simple.rst

@@ -817,7 +817,7 @@ case we just write some information out to a ``failures`` file:
         # we only look at actual failing test calls, not setup/teardown
         if rep.when == "call" and rep.failed:
             mode = "a" if os.path.exists("failures") else "w"
-            with open("failures", mode) as f:
+            with open("failures", mode, encoding="utf-8") as f:
                 # let's also access a fixture for the fun of it
                 if "tmp_path" in item.fixturenames:
                     extra = " ({})".format(item.funcargs["tmp_path"])