T7921: Bump accel-ppp-ng to d13b611

ff6751e doc: Added description of vpp-policer to config manual.
50787a9 vpp: Added basic vpp policer configuration.

Author: sever-sever

scripts/package-build/linux-kernel/package.toml

@@ -18,7 +18,7 @@ build_cmd = "build_linux_firmware"
 
 [[packages]]
 name = "accel-ppp-ng"
-commit_id = "d8c4d38"
+commit_id = "a9ceadc"
 scm_url = "https://github.com/accel-ppp/accel-ppp-ng.git"
 build_cmd = "build_accel_ppp_ng"