add provider version number.

Author: tjholm

src/pages/reference/providers/gcp/configuration.mdx

@@ -58,6 +58,7 @@ config:
       # set 0 GPUs
       # See cloudrun configuration docs here:
       # https://cloud.google.com/run/docs/configuring
+      # Available since 1.13.0
       gpus: 0
       # set a timeout of 15 seconds
       # https://cloud.google.com/run/docs/configuring/request-timeout