Revert change that caused the credentials in source url issue (#5882)

* fully revert this change to fix the credentials in source url issue

news/5878.bugfix.rst

@@ -0,0 +1 @@
+Revert change that caused the credentials in source url issue.

pipenv/utils/resolver.py

@@ -266,7 +266,7 @@ class Resolver:
         pip_args.extend(["--cache-dir", self.project.s.PIPENV_CACHE_DIR])
         return pip_args
 
-    @cached_property
+    @property  # cached_property breaks authenticated private indexes
     def pip_args(self):
         use_pep517 = environments.get_from_env("USE_PEP517", prefix="PIP")
         build_isolation = environments.get_from_env("BUILD_ISOLATION", prefix="PIP")
@@ -298,7 +298,7 @@ class Resolver:
         )
         return default_constraint_filename
 
-    @cached_property
+    @property  # cached_property breaks authenticated private indexes
     def pip_options(self):
         pip_options, _ = self.pip_command.parser.parse_args(self.pip_args)
         pip_options.cache_dir = self.project.s.PIPENV_CACHE_DIR