Correct default from disabled to auto. See #11939.

Author: Darsstar

news/CD497476-8620-449D-8E31-799CDBCF3FD6.trivial.rst

@@ -257,7 +257,7 @@ class PipOption(Option):
     "--keyring-provider",
     dest="keyring_provider",
     choices=["auto", "disabled", "import", "subprocess"],
-    default="disabled",
+    default="auto",
     help=(
         "Enable the credential lookup via the keyring library if user input is allowed."
         " Specify which mechanism to use [disabled, import, subprocess]."