[poetry] Poetry.build fails on terms that support ansi color. (#778)

`poetry build` emits color codes around the build artifact name
on some terminals (windows conemu).  Failure looks like this:

OSError: [WinError 123] The filename, directory name, or volume label
syntax is incorrect:
'dist\\\x1b[32mnox_poetry-1.0.0-py3-none-any.whl\x1b[0m'

Co-authored-by: Cycle Driver <cycledriver42@gmail.com>

src/nox_poetry/poetry.py

@@ -138,6 +138,7 @@ def build(self, *, format: str) -> str:
             "poetry",
             "build",
             f"--format={format}",
+            "--no-ansi",
             external=True,
             silent=True,
             stderr=None,