API docs: fix AsyncAuthManagers.basic example (#1110)

The example used an old version of `ExpiringAuth`. Before version 5.9,
`ExpiringAuth` accepted an `expires_in` parameter, which then was changed to
`expires_at` while `expires_in` was moved to be a convenience method on
`ExpiringAuth` instances.

However, the example code in `AsyncAuthManagers.basic` was not adjusted.

Author: robsdedude

src/neo4j/_async/auth_management.py

@@ -273,12 +273,12 @@ async def auth_provider():
                 # assume we know our tokens expire every 60 seconds
                 expires_in = 60
 
-                return ExpiringAuth(
-                    auth=neo4j.bearer_auth(sso_token),
-                    # Include a little buffer so that we fetch a new token
-                    # *before* the old one expires
-                    expires_in=expires_in - 10
-                )
+                # Include a little buffer so that we fetch a new token
+                # *before* the old one expires
+                expires_in -= 10
+
+                auth = neo4j.bearer_auth(sso_token)
+                return ExpiringAuth(auth=auth).expires_in(expires_in)
 
 
             with neo4j.GraphDatabase.driver(

src/neo4j/_sync/auth_management.py

@@ -273,12 +273,12 @@ def auth_provider():
                 # assume we know our tokens expire every 60 seconds
                 expires_in = 60
 
-                return ExpiringAuth(
-                    auth=neo4j.bearer_auth(sso_token),
-                    # Include a little buffer so that we fetch a new token
-                    # *before* the old one expires
-                    expires_in=expires_in - 10
-                )
+                # Include a little buffer so that we fetch a new token
+                # *before* the old one expires
+                expires_in -= 10
+
+                auth = neo4j.bearer_auth(sso_token)
+                return ExpiringAuth(auth=auth).expires_in(expires_in)
 
 
             with neo4j.GraphDatabase.driver(