check_requirements() Windows fix (#7997)

utils/general.py

@@ -355,7 +355,7 @@ def check_requirements(requirements=ROOT / 'requirements.txt', exclude=(), insta
                 LOGGER.info(f"{s}, attempting auto-update...")
                 try:
                     assert check_online(), f"'pip install {r}' skipped (offline)"
-                    LOGGER.info(check_output(f"pip install '{r}' {cmds[i] if cmds else ''}", shell=True).decode())
+                    LOGGER.info(check_output(f"pip install {r} {cmds[i] if cmds else ''}", shell=True).decode())
                     n += 1
                 except Exception as e:
                     LOGGER.warning(f'{prefix} {e}')