Use File APIs when comparing paths in the AggregatedPackagesTransform.

Using file APIs allows for platform-agnostic path comparisons where as File#parent() returns a String which will contain path separators that are OS specific and will fail to match with the known aggregated packages path that use UNIX-based file separator '/'. Specifically this fixes an issue for Windows users whose file separators are '\'. Note that JarEntry path matching is String based but well formatted Jar files (which are Zip files) regardless of the host OS use forward slashes as path separator.

Fixes #2695

RELNOTES=Fix an issue where `enableAggregatingTask` would not correctly generate Hilt classes when compiling in a dev environment with Windows OS.
PiperOrigin-RevId: 381877388

java/dagger/hilt/android/plugin/src/main/kotlin/dagger/hilt/android/plugin/util/AggregatedPackagesTransform.kt

@@ -77,7 +77,7 @@ abstract class AggregatedPackagesTransform : TransformAction<TransformParameters
         outputs.file(JAR_NAME).outputStream().use { tmpOutputStream.writeTo(it) }
       }
     } else if (file.isClassFile()) {
-      val parentDirectory = file.parent
+      val parentDirectory = file.parentFile
       val match = AGGREGATED_PACKAGES.any { aggregatedPackage ->
         parentDirectory.endsWith(aggregatedPackage)
       }