fix(deps): update github.com/shortlink-org/go-sdk/grpc digest to 15cb7da

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
github.com/shortlink-org/go-sdk/grpc	require	digest	453281b → 15cb7da

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[renovate]

ℹ️ Artifact update notice

File name: raft/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/shortlink-org/go-sdk/auth	v0.0.0-20260107222411-453281b10921 -> v0.0.0-20260303191922-67c81c34e0a2