fix(deps): update github.com/longhorn/backupstore digest to e33cb12 (v1.6.x)

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
github.com/longhorn/backupstore	require	digest	6a6dfbf -> e33cb12

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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):

• 3 additional dependencies were updated

Details:

Package	Change
google.golang.org/grpc	v1.66.2 -> v1.67.0
github.com/longhorn/go-common-libs	v0.0.0-20240914083622-928beb30c12e -> v0.0.0-20240921050101-797b589b669d
google.golang.org/genproto/googleapis/rpc	v0.0.0-20240604185151-ef581f913117 -> v0.0.0-20240814211410-ddb44dafa142