stubs generation seems broken in 1.3.0-rc-51: ``` ...

# kapt

[jw]

stubs generation seems broken in 1.3.0-rc-51:

A problem occurred configuring project ':sqldelight-core'.
> Failed to notify project evaluation listener.
   > Could not create task ':sqldelight-core:kaptGenerateStubsKotlin'.
      > Property sourceSetName should be initialized before get.
   > Could not create task ':sqldelight-core:kaptGenerateStubsTestKotlin'.
      > Property sourceSetName should be initialized before get.

Filed as https://youtrack.jetbrains.com/issue/KT-26974