fix: correct printing of errors

Instead of printing err (which is a handle to rich formatter)
we print errors - which are the real output of the failed command.

Signed-off-by: Oz Tiram <oz.tiram@gmail.com>

pipenv/utils/resolver.py

@@ -767,7 +767,7 @@ def resolve(cmd, st, project):
         st.console.print(environments.PIPENV_SPINNER_FAIL_TEXT.format("Locking Failed!"))
         err.print(out.strip())
         if not is_verbose:
-            err.print(err)
+            err.print(errors)
         raise RuntimeError("Failed to lock Pipfile.lock!")
     if is_verbose:
         err.print(out.strip())