Update tensorflow-metadata to 1.15.0

Author: Michel Davit

build.sbt

@@ -42,7 +42,7 @@ val scalaCollectionCompatVersion = "2.12.0"
 val scalacheckVersion = "1.17.0"
 val shapelessVersion = "2.3.12"
 val slf4jVersion = "2.0.13"
-val tensorflowMetadataVersion = "1.10.0"
+val tensorflowMetadataVersion = "1.15.0"
 val tensorflowVersion = "0.5.0"
 
 // project
@@ -229,16 +229,17 @@ ThisBuild / mimaBinaryIssueFilters ++= Seq(
 ThisBuild / tlVersionIntroduced := Map("3" -> "0.8.0")
 
 // protobuf
+val protocJavaSourceManaged =
+  settingKey[File]("Default directory for java sources generated by protoc.")
 ThisBuild / PB.protocVersion := protobufVersion
 lazy val scopedProtobufSettings = Def.settings(
   PB.targets := Seq(
-    PB.gens.java -> (ThisScope.copy(config = Zero) / sourceManaged).value /
-      "compiled_proto" /
-      configuration.value.name
+    PB.gens.java(protobufVersion) -> Defaults.configSrcSub(protocJavaSourceManaged).value
   ),
   managedSourceDirectories ++= PB.targets.value.map(_.outputPath)
 )
 lazy val protobufSettings = Seq(
+  protocJavaSourceManaged := sourceManaged.value / "compiled_proto",
   PB.additionalDependencies := Seq(
     "com.google.protobuf" % "protobuf-java" % protobufVersion % Provided,
     "com.google.protobuf" % "protobuf-java" % protobufVersion % Test