Reorder __all__

The list is *almost* sorted alphabetically so let's make it fully so.

Author: uranusjr

src/pip/_internal/locations/__init__.py

@@ -25,10 +25,10 @@
     "USER_CACHE_DIR",
     "get_bin_prefix",
     "get_bin_user",
+    "get_isolated_environment_bin_path",
+    "get_isolated_environment_lib_paths",
     "get_major_minor_version",
     "get_platlib",
-    "get_isolated_environment_lib_paths",
-    "get_isolated_environment_bin_path",
     "get_purelib",
     "get_scheme",
     "get_src_prefix",