deps: bump luxfi/vm v1.2.0, sampler v1.1.0, staking v1.5.0 (relicense)

Picks up the 2026-06-06 relicensing:
- luxfi/vm v1.2.0 → Lux Ecosystem License v1.2 (was Lux Research v1.0).
  License-only retag of the extracted runtime; patent reservation
  preserved for runtime optimization surfaces, royalty-free for
  Descending Chains.
- luxfi/sampler v1.1.0 → BSD-3-Clause (was Lux Research v1.0).
  License restored to match the luxfi/node provenance (originally
  extracted from node/utils/sampler).
- luxfi/staking v1.5.0 → BSD-3-Clause (was Lux Research v1.0).
  License restored to match the luxfi/node provenance.

No code changes in this commit — go.mod/go.sum only.

go.mod

@@ -5,7 +5,7 @@ go 1.26.3
 require (
 	github.com/luxfi/ids v1.2.9
 	github.com/luxfi/math/big v0.1.0
-	github.com/luxfi/sampler v1.0.0
+	github.com/luxfi/sampler v1.1.0
 	github.com/stretchr/testify v1.11.1
 	github.com/zeebo/blake3 v0.2.4
 	golang.org/x/exp v0.0.0-20260312153236-7ab1446f8b90

go.sum

@@ -15,8 +15,8 @@ github.com/luxfi/math/big v0.1.0 h1:Vz4c0RsZVPdIKPsHPgAJChH/R3p15WHRUz7LkLf+NIQ=
 github.com/luxfi/math/big v0.1.0/go.mod h1:BuxSu22RbO93xBLk5Eam5nldFponoJ73xDFz4uJ3Huk=
 github.com/luxfi/mock v0.1.0 h1:IwElfNu+T9sXvzFX6tudPDx1vqPuACRSRdxpD5lxW+o=
 github.com/luxfi/mock v0.1.0/go.mod h1:izF+9K0gGzFC9zERn6Po37v46eLdPB+EIsDjL3GLk+U=
-github.com/luxfi/sampler v1.0.0 h1:k8Sf6otW83w4pQp0jXLA+g3J/joB7w7SqXQsWmNTOV0=
-github.com/luxfi/sampler v1.0.0/go.mod h1:f96/ozlj9vFfZj+akLtrHn4VpulQahwB+MQQhpeIekk=
+github.com/luxfi/sampler v1.1.0 h1:u3iRDl7V06ARh0e85h3HT+aZ1saCFo2yMMsh+dCJbqk=
+github.com/luxfi/sampler v1.1.0/go.mod h1:kJa53S3tC9+VSbuV3RFu68MmbCCBlr2UM39LOClQ/Hs=
 github.com/mr-tron/base58 v1.2.0 h1:T/HDJBh4ZCPbU39/+c3rRvE0uKBQlU27+QI8LJ4t64o=
 github.com/mr-tron/base58 v1.2.0/go.mod h1:BinMc/sQntlIE1frQmRFPUoPA1Zkr8VRgBdjWI2mNwc=
 github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 h1:Jamvg5psRIccs7FGNTlIRMkT8wgtp5eCXdBlqhYGL6U=