TensorFlow: @_functionBuilder -> @resultBuilder (#1174)

The function builder attribute has been renamed to `resultBuilder`.
Adjust the sources accordingly.

Author: compnerd

Sources/TensorFlow/Layers/Sequential.swift

@@ -203,7 +203,7 @@ where
   L8.TangentVector.VectorSpaceScalar == L9.TangentVector.VectorSpaceScalar,
   L9.TangentVector.VectorSpaceScalar == L10.TangentVector.VectorSpaceScalar
 
-@_functionBuilder
+@resultBuilder
 public struct LayerBuilder {
   public static func buildBlock<L1: Module, L2: Layer>(_ l1: L1, _ l2: L2) -> Sequential<L1, L2>
   where L1.Output == L2.Input {

Sources/TensorFlow/Layers/Sequential.swift.gyb

@@ -99,7 +99,7 @@ public typealias Sequential${n}<${generic_parameters(n, ", ")}> = ${sequential_t
 
 %end
 
-@_functionBuilder
+@resultBuilder
 public struct LayerBuilder {
     public static func buildBlock<L1: Module, L2: Layer>(_ l1: L1, _ l2: L2) -> Sequential<L1, L2>
         where L1.Output == L2.Input {