Fix GString to String type cast failing

[prateekma]

It seems that the cast from GString to String is failing here. The toString() cast is present when returning other dependencies but it isn't present on this one.

Log:

class org.codehaus.groovy.runtime.GStringImpl cannot be cast to class java.lang.String (org.codehaus.groovy.runtime.GStringImpl is in unnamed module of loader org.gradle.internal.classloader.VisitableURLClassLoader @7823a2f9; java.lang.String is in module java.base of loader 'bootstrap')
Possible causes for this unexpected error include:<ul><li>Gradle's dependency cache may be corrupt (this sometimes occurs after a network connection timeout.)

[prateekma]

While using the Kotlin DSL, the commented code below is expected to work. The current workaround which seems to work is the code that is not commented.

 // wpi.deps.vendor.java().forEach { compile(it) }

    wpi.deps.vendor.dependencies.map { dep ->
        dep.javaDependencies.map { art ->
            "${art.groupId}:${art.artifactId}:${WPIVendorDepsExtension.getVersion(art.version, wpi.deps.vendor.wpiExt)}"
        }
    }.forEach { it.forEach { compile(it) } }

[JaciBrunning]

Thanks!