Remove outdated comment

extractor/build.gradle

@@ -29,8 +29,6 @@ dependencies {
     implementation 'org.jsoup:jsoup:1.17.2'
     implementation "com.github.spotbugs:spotbugs-annotations:$spotbugsVersion"
 
-    // do not upgrade to 1.7.14, since in 1.7.14 Rhino uses the `SourceVersion` class, which is not
-    // available on Android (even when using desugaring), and `NoClassDefFoundError` is thrown
     implementation 'org.mozilla:rhino:1.7.15'
 
     checkstyle "com.puppycrawl.tools:checkstyle:$checkstyleVersion"