`starred` is a required argument of the
`arcade_github.activity.set_starred` tool, but when it is not provided
in the tool call, the engine is somehow passing it with a falsy value,
instead of raising an error. the falsy value makes the tool unstar a
repo by default, which is not the desired behavior.
we're setting the `starred` arg to True in the tool interface to prevent
that.
aa0cd02fe9