chore: fix minor generate.toml syntax issue (#131)

## What's Changed

Fixes a very minor syntax issue in generate.toml. This field is a
boolean. I've tested adbc-gen-workflow still runs fine in either case so
this is just about levels of correct.

Author: amoeba

.github/workflows/generate.toml

@@ -15,4 +15,4 @@
 driver = "databricks"
 
 [lang]
-go = "true"
+go = true