Update rv003usb example and safegurad used ch32fun version

Author: maxgerhardt

examples/ch32fun-rv003usb-composite-hid/platformio.ini

@@ -22,6 +22,6 @@ lib_deps = https://github.com/cnlohr/rv003usb.git#69729219e526156aba57985224adcc
 extra_scripts =
   ; convenience for showing USB descriptors in intellisense
   pre:$PROJECT_LIBDEPS_DIR/$PIOENV/rv003usb/.github/show_descriptors.py
-; safeguard: actually compile against older ch32fun version.
+; safeguard: actually compile against a safe ch32fun version for now that was referenced by the project.
 platform_packages = 
-  framework-ch32v003fun@symlink://.pio/libdeps/genericCH32V003F4U6/rv003usb/ch32fun
+  framework-ch32v003fun@https://github.com/cnlohr/ch32fun.git#a3ceb50356b1894eece3824673b4533ef5d2ad2a