Pin down LXD and use dqlite LTS for microcluster #1758

Job	Run time
Code	2m 20s
documentation-checks / Run documentation checks	1m 21s
System (add, 24.04, 1.22.x, latest/edge, latest/edge, 5.21/edge, latest/edge)	24m 29s
System (instances, 24.04, 1.22.x, latest/edge, latest/edge, 5.21/edge, latest/edge)	36m 28s
System (basic, 24.04, 1.22.x, latest/edge, latest/edge, 5.21/edge, latest/edge)	1h 19m 39s
System (recover, 24.04, 1.22.x, latest/edge, latest/edge, 5.21/edge, latest/edge)	16m 30s
System (interactive, 24.04, 1.22.x, latest/edge, latest/edge, 5.21/edge, latest/edge)	1h 55m 30s
System (mismatch, 24.04, 1.22.x, latest/edge, latest/edge, 5.21/edge, latest/edge)	29m 39s
System (preseed, 24.04, 1.22.x, latest/edge, latest/edge, 5.21/edge, latest/edge)	25m 28s
System (upgrade, 22.04, 1.22.x, reef/stable, 22.03/stable, 5.21/stable, 1/stable)	24m 50s
System (upgrade, 24.04, 1.22.x, 5.21/stable, reef/stable, 22.03/stable, 1/stable)	27m 6s
Tiobe TICS	0s
Trigger snap edge build	0s
	6h 23m 20s

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