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

@@ -31,7 +31,7 @@ require (
 	github.com/luxfi/mock v0.1.1 // indirect
 	github.com/luxfi/p2p v1.21.1 // indirect
 	github.com/luxfi/pq v1.0.3 // indirect
-	github.com/luxfi/sampler v1.0.0 // indirect
+	github.com/luxfi/sampler v1.1.0 // indirect
 	github.com/luxfi/validators v1.0.0 // indirect
 	github.com/luxfi/version v1.0.1 // indirect
 	github.com/luxfi/warp v1.19.2 // indirect

go.sum

@@ -56,8 +56,8 @@ github.com/luxfi/p2p v1.21.1 h1:gmz1JMDhzHIL3dQlhwIDvR4OlFuhNVfnWUl/ipYhAIo=
 github.com/luxfi/p2p v1.21.1/go.mod h1:SsNPR5fPGWWNem9plGWhSmRqyDoysJ3kPAN0zG0g3iw=
 github.com/luxfi/pq v1.0.3 h1:pFlQm1+5FuKTDUh2y/23bXWkN4I2Rc5iuxJypwDFFMs=
 github.com/luxfi/pq v1.0.3/go.mod h1:8bppZcRElfrVt0n3nYCZW3iX1TvhvzNbdjNdK1irgIE=
-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/luxfi/utils v1.1.4 h1:8OY0jXCkpp6OotN1Y++6DATJkvtEwzq2k0p56imJlAk=
 github.com/luxfi/utils v1.1.4/go.mod h1:c3yz1RjzrB+cs5GZm+q1T3/2cCKElO9vxm9yRRtgSEM=
 github.com/luxfi/validators v1.0.0 h1:zE1HJM1lfvC+v1Lalg+MUgkKBGFWnwTfOOmXraiNnpE=