Further gha-scala-library-release-workflow tweaks

Further to #102 (comment),
these are a few more tweaks:

* Delete the entire `sonatype.sbt` file that was providing these keys that
  `gha-scala-library-release-workflow` now takes care of for us:
  * `sonatypeProfileName` - see https://github.com/guardian/gha-scala-library-release-workflow/blob/7d278d4d44e30b4b4c0f6791053bdeb40b8159cb/.github/workflows/reusable-release.yml#L258
  * `publishTo` - see guardian/facia-scala-client#299 (comment)
  * `scmInfo` & `pomExtra` - see guardian/facia-scala-client#299 (review)
  * `homepage` - https://github.com/xerial/sbt-sonatype/blob/da75ed2efe29e7d674a6d6af5103b4aa1cecefb8/src/main/scala/xerial/sbt/Sonatype.scala#L368
* Specify Java 11-compatible bytecode - see https://github.com/guardian/facia-scala-client/pull/299/files#r1425630691

As part of some of these changes, I've also removed the vestiges of the build-configuration that
adapted the build for Scala 2.11 & 2.12 (eg the `versionDependent()` helper method) - these are
no longer need since #78 removed support for Scala 2.12
in January 2023.

README.md

@@ -1,4 +1,4 @@
-Marley [![Maven Central](https://maven-badges.herokuapp.com/maven-central/com.gu/marley_2.12/badge.svg)](https://maven-badges.herokuapp.com/maven-central/com.gu/marley_2.12)
+Marley [![Maven Central](https://maven-badges.herokuapp.com/maven-central/com.gu/marley_2.12/badge.svg)](https://maven-badges.herokuapp.com/maven-central/com.gu/marley_2.12) [![Release](https://github.com/guardian/marley/actions/workflows/release.yml/badge.svg)](https://github.com/guardian/marley/actions/workflows/release.yml)
 ======
 
 Marley is a library for serialising [Scrooge](https://twitter.github.io/scrooge/) generated classes representing 
@@ -30,7 +30,8 @@ val readStructs: Iterable[ExampleStruct] = AvroFile.read[ExampleStruct](file)
 Is this usable in production?
 -----------------------------
 
-Marley has been extracted from a project where it's been running successfully for a number of months.
+Marley has been used successfully in the Guardian's realtime analytics system
+Ophan for many years.
 
 Marley is macro based and doesn't perform any runtime reflection. I haven't 
 done any micro-benchmarking, but it's currently serialising more than 5000 

build.sbt

@@ -1,31 +1,21 @@
 import sbtversionpolicy.withsbtrelease.ReleaseVersion.fromAggregatedAssessedCompatibilityWithLatestRelease
 
-ThisBuild/scalaVersion := "2.13.12"
-
-ThisBuild/crossScalaVersions := Seq(scalaVersion.value)
+ThisBuild / scalaVersion := "2.13.12"
 
 val commonSettings = Seq(
   organization := "com.gu",
-  homepage := Some(url("https://github.com/guardian/marley")),
-  licenses := Seq("Apache V2" -> url("http://www.apache.org/licenses/LICENSE-2.0.html")),
-  releaseVersion := fromAggregatedAssessedCompatibilityWithLatestRelease().value,
+  licenses := Seq("Apache V2" -> url("https://www.apache.org/licenses/LICENSE-2.0.html")),
   libraryDependencies ++= Seq(
     "org.scala-lang" % "scala-reflect" % scalaVersion.value,
     "com.twitter" %% "scrooge-core" % "22.12.0",
     "org.apache.thrift" % "libthrift" % "0.17.0"
   )
 )
 
-def versionDependent[T](scalaV: String, handlesAnnotations: Boolean, value: T):Option[T] = {
-  val preMacroAnnotationsScalaVersions = Set("2.11", "2.12")
-  Some(value).filter(_ => handlesAnnotations != preMacroAnnotationsScalaVersions.contains(scalaV))
-}
-
 lazy val core = project.settings(
   name := "marley",
-  Compile / scalacOptions += versionDependent(scalaBinaryVersion.value, handlesAnnotations=true, "-Ymacro-annotations"),
-  libraryDependencies ++= versionDependent(scalaBinaryVersion.value, handlesAnnotations=false,
-    compilerPlugin("org.scalamacros" % "paradise" % "2.1.1" cross CrossVersion.full)).toSeq ++ Seq(
+  Compile / scalacOptions ++= Seq("-release:11", "-Ymacro-annotations"),
+  libraryDependencies ++= Seq(
     "org.apache.avro" % "avro" % "1.11.1",
     "org.xerial.snappy" % "snappy-java" % "1.1.10.5",
     "org.parboiled" %% "parboiled" % "2.5.0",
@@ -37,22 +27,20 @@ lazy val core = project.settings(
     TestFrameworks.ScalaTest,
     "-u", s"test-results/scala-${scalaVersion.value}"
   )
-).settings(commonSettings: _*).dependsOn(thriftExample % "test->test")
+).settings(commonSettings).dependsOn(thriftExample % "test->test")
 
-lazy val thriftExample = project.settings(commonSettings: _*)
-
-Test/publishArtifact := false
+lazy val thriftExample = project.settings(commonSettings).settings(
+  publish / skip := true,
+)
 
 lazy val root = (project in file(".")).aggregate(core).settings(
-  update/aggregate := false,
-  publish/skip := true,
+  update / aggregate := false,
+  publish / skip := true,
 )
 
-import ReleaseTransformations._
-import sbt.Keys.scalaBinaryVersion
-
-releaseCrossBuild := true // true if you cross-build the project for multiple Scala versions
+import ReleaseTransformations.*
 
+releaseVersion := fromAggregatedAssessedCompatibilityWithLatestRelease().value
 releaseProcess := Seq[ReleaseStep](
   checkSnapshotDependencies,
   inquireVersions,