docs(python): fix intersphinx link for google-auth

docs/conf.py

@@ -346,10 +346,7 @@
 # Example configuration for intersphinx: refer to the Python standard library.
 intersphinx_mapping = {
     "python": ("https://python.readthedocs.org/en/latest/", None),
-    "google-auth": (
-        "https://googleapis.dev/python/google-auth/latest/index.html",
-        None,
-    ),
+    "google-auth": ("https://googleapis.dev/python/google-auth/latest/", None),
     "google.api_core": ("https://googleapis.dev/python/google-api-core/latest/", None,),
     "grpc": ("https://grpc.github.io/grpc/python/", None),
     "proto-plus": ("https://proto-plus-python.readthedocs.io/en/latest/", None),

synth.metadata

@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/python-asset.git",
-        "sha": "9c7b9773c3ef4e0984f185a3a953c910ee0fe36e"
+        "sha": "a020a9c0bfe43d2e079579f39292a7a970ceca8e"
       }
     },
     {
@@ -19,14 +19,14 @@
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "39b7149da4026765385403632db3c6f63db96b2c"
+        "sha": "a073c873f3928c561bdf87fdfbf1d081d1998984"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "39b7149da4026765385403632db3c6f63db96b2c"
+        "sha": "a073c873f3928c561bdf87fdfbf1d081d1998984"
       }
     }
   ],