Add note to keep rhinoVersion below 1.9.0

Author: TobiGr

gradle/libs.versions.toml

@@ -12,7 +12,7 @@ jsoup = "1.21.2"
 okhttp = "5.3.2"
 protobuf-lib = "4.33.2"
 protobuf-plugin = "0.9.6"
-rhino = "1.8.1"
+rhino = "1.8.1" # rhino 1.9.0 requires Android minSDK >= 26, see #1423
 teamnewpipe-nanojson = "e9d656ddb49a412a5a0a5d5ef20ca7ef09549996"
 
 [libraries]