Python 3.6 compatibility fix. (#8516)

* Python 3.6 compatibility fix.

The capture_output argument to subprocess.run() was not introduced until
Python 3.7.  Use stdout=subprocess.PIPE and stderr=subprocess.PIPE instead,
which is equivalent.

* Update pyproject.toml

* Black

---------

Co-authored-by: Matthew Ryan <matt.ryan@nominum.com>
Co-authored-by: Paul Kehrer <paul.l.kehrer@gmail.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/setup.py b/setup.py
index 2d084d1ef..e1adff269 100644
--- a/setup.py
+++ b/setup.py
@@ -101,7 +101,8 @@ except:  # noqa: E722
             # If for any reason `rustc --version` fails, silently ignore it
             rustc_output = subprocess.run(
                 ["rustc", "--version"],
-                capture_output=True,
+                stdout=subprocess.PIPE,
+                stderr=subprocess.PIPE,
                 timeout=0.5,
                 encoding="utf8",
                 check=True,