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**Problem**
When cross-building sbt plugins with explicit `scalaVersion` set in `build.sbt`, the `updateSbtClassifiers` task fails because it uses the launcher's Scala version instead of the appropriate Scala version for the target sbt version.
For example, with this configuration:
```scala
lazy val root = (project in file("."))
.enablePlugins(SbtPlugin)
.settings(
scalaVersion := "2.10.7", // Explicit for IDE support
crossSbtVersions := Seq("0.13.17", "1.0.0"),
)
```
Running sbt "show updateSbtClassifiers" would fail with:
Error downloading org.scala-sbt:scripted-plugin_2.12:0.13.17
It should look for scripted-plugin_2.10:0.13.17 since sbt 0.13.x uses Scala 2.10.
**Solution**
Modified sbtClassifiersTasks in Defaults.scala to:
1. Check if the project is an sbt plugin (sbtPlugin.value)
2. For plugins, derive the Scala version from pluginCrossBuild / sbtBinaryVersion using PluginCross.scalaVersionFromSbtBinaryVersion
3. For non-plugins, continue using the launcher's Scala version (original behavior)
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