fix(deps): update github.com/longhorn/backupstore digest to ae6fea5 (v1.6.x)

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
github.com/longhorn/backupstore	require	digest	98df727 -> ae6fea5

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[renovate]

ℹ Artifact update notice

File name: go.mod

In order to perform the update(s) described in the table above, Renovate ran the go get command, which resulted in the following additional change(s):

• 1 additional dependency was updated

Details:

Package	Change
github.com/longhorn/go-common-libs	v0.0.0-20240907130740-7060fefb5bda -> v0.0.0-20240914083622-928beb30c12e