The `gcp_stackdriver_logging` sink has been renamed to `gcp_stackdriver_logs`

This brings the sink naming inline with consistent naming pattern

We’ve renamed the gcp_stackdriver_logging sink to gcp_stackdriver_logs to bring it in-line with consistent naming patterns. Migration is easy.

Upgrade Guide

 [sinks.stackdriver]
-  type = "gcp_stackdriver_logging"
+  type = "gcp_stackdriver_logs"