incusd: Update for math/rand deprecation #92

Job	Run time
Client tests (1.20.x, ubuntu-latest)	1m 30s
System tests (1.20.x, cluster, dir)	13m 31s
Documentation tests	8m 33s
Client tests (1.20.x, macos-latest)	1m 35s
Code tests	11m 30s
System tests (1.20.x, cluster, btrfs)	15m 34s
Client tests (1.20.x, windows-latest)	3m 41s
System tests (1.20.x, cluster, lvm)	13m 44s
System tests (1.20.x, cluster, zfs)	14m 29s
System tests (1.20.x, cluster, ceph)	20m 34s
System tests (1.20.x, cluster, random)	14m 56s
System tests (1.20.x, standalone, dir)	24m 18s
System tests (1.20.x, standalone, btrfs)	22m 47s
System tests (1.20.x, standalone, lvm)	38m 8s
System tests (1.20.x, standalone, zfs)	43m 57s
System tests (1.20.x, standalone, ceph)	1h 13m 27s
System tests (1.20.x, standalone, random)	36m 26s
System tests (stable, cluster, dir)	14m 32s
System tests (stable, standalone, dir)	22m 31s
System tests (tip, cluster, dir)	14m 0s
System tests (tip, standalone, dir)	23m 10s
	7h 12m 53s

Provide feedback