Fix sourcePath to String rather than URI

Author: jkschneider

src/main/java/org/openrewrite/java/spring/boot2/ValueToConfigurationProperties.java

@@ -150,7 +150,7 @@ public Collection<SourceFile> generate() {
                 J.CompilationUnit cu = fillConfigurationPropertiesTypeAttribution(
                         jp.reset().parse(newClassText)
                                 .get(0)
-                                .withSourcePath(sourcePath.toUri()));
+                                .withSourcePath(sourcePath.toString()));
                 generatedClasses.put(className, cu);
                 return cu;