update liburing source URL to kernel.org #2639

Job	Run time
packages (arm64-secure, arm64)	43m 40s
packages (ubuntu-20.04, amd64)	12m 19s
packages (ubuntu-latest, riscv64)	4m 38s
manifest	5m 14s
verification (arm64, kvm)	9m 18s
eve (arm64, kvm)	39m 4s
verification (arm64, xen)	9m 34s
eve (arm64, xen)	37m 20s
verification (amd64, kvm)	4m 32s
eve (amd64, kvm)	39m 51s
verification (amd64, xen)	9m 20s
eve (amd64, xen)	36m 40s
eve (riscv64, mini)	5m 38s
trigger_assets	0s
	4h 17m 8s

Provide feedback