fix(evaluator): Use invariant paths in ProjectSourceRule

This fixes `ProjectSourceRuleTest` on Windows.

Signed-off-by: Sebastian Schuberth <sebastian@doubleopen.org>

evaluator/src/main/kotlin/ProjectSourceRule.kt

@@ -69,15 +69,17 @@ open class ProjectSourceRule(
      */
     fun projectSourceFindDirectories(vararg patterns: String): List<File> =
         projectSourcesDir.walkBottomUp().filterTo(mutableListOf()) {
-            it.isDirectory && FileMatcher.match(patterns.asList(), it.relativeTo(projectSourcesDir).path)
+            val path = it.relativeTo(projectSourcesDir).invariantSeparatorsPath
+            it.isDirectory && FileMatcher.match(patterns.asList(), path)
         }
 
     /**
      * Return all files from the project's source tree which match any of the provided [glob expressions][patterns].
      */
     fun projectSourceFindFiles(vararg patterns: String): List<File> =
         projectSourcesDir.walkBottomUp().filterTo(mutableListOf()) {
-            it.isFile && FileMatcher.match(patterns.asList(), it.relativeTo(projectSourcesDir).path)
+            val path = it.relativeTo(projectSourcesDir).invariantSeparatorsPath
+            it.isFile && FileMatcher.match(patterns.asList(), path)
         }
 
     /**