Update to slash syntax in sbt

Author: thesamet

build.sbt

@@ -6,7 +6,7 @@ sonatypeProfileName := "com.thesamet"
 
 sonatypeBundleDirectory := (ThisBuild / baseDirectory).value / "target" / "sonatype-staging"
 
-skip in publish := true
+publish / skip := true
 
 /* Skipping common protos due to https://github.com/googleapis/api-common-protos/issues/83
 def commonProtos =

project/BuildHelpers.scala

@@ -60,11 +60,11 @@ final case class ProtosProject(
           "sh",
           "unix"
         )),
-        PB.targets in Compile := Seq(
+        Compile / PB.targets := Seq(
           (
             PB.gens.plugin("scala"),
             Seq("java_conversions")
-          ) -> (sourceManaged in Compile).value / "protobuf"
+          ) -> (Compile / sourceManaged).value / "protobuf"
         ),
         createTags := createTagsImpl.value,
         publish / skip := (sys.env