change version output to json so it's consistent in linux vs windows

nox/virtualenv.py

@@ -17,6 +17,7 @@
 import abc
 import contextlib
 import functools
+import json
 import os
 import platform
 import re
@@ -69,13 +70,13 @@ def find_uv() -> tuple[bool, str]:
 
 def uv_version() -> version.Version:
     ret = subprocess.run(
-        [UV, "--version"],
+        [UV, "version", "--output-format", "json"],
         check=False,
         text=True,
         capture_output=True,
     )
     if ret.returncode == 0 and ret.stdout:
-        return version.Version(ret.stdout.strip().lstrip("uv "))
+        return version.Version(json.loads(ret.stdout).get("version"))
     else:
         logger.info("Failed to establish uv's version.")
         return version.Version("0.0")

tests/test_virtualenv.py

@@ -628,15 +628,15 @@ def find_uv_bin():
 @pytest.mark.parametrize(
     ["return_code", "stdout", "expected_result"],
     [
-        (0, "uv 0.2.3", "0.2.3"),
+        (0, '{"version": "0.2.3", "commit_info": null}', "0.2.3"),
         (1, None, "0.0"),
-        (1, "uv 9.9.9", "0.0"),
+        (1, '{"version": "9.9.9", "commit_info": null}', "0.0"),
     ],
 )
 def test_uv_version_error(monkeypatch, return_code, stdout, expected_result):
     def mock_run(*args, **kwargs):
         return subprocess.CompletedProcess(
-            args=["uv", "--version"],
+            args=["uv", "version", "--output-format", "json"],
             stdout=stdout,
             returncode=return_code,
         )