chore: Update docs/dyn index (#1254)

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diff --git a/synth.metadata b/synth.metadata
index cdb28e2..7e94376 100644
--- a/synth.metadata
+++ b/synth.metadata
@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/google-api-python-client.git",
-        "sha": "1b1171d09d4c39542e0749eefb1b0bc7b38a9d6a"
+        "sha": "c518472e836c32ba2ff5e8480ab5a7643f722d46"
       }
     },
     {