fix(deps): pin published utxo v0.5.1, drop local ../utxo replace — unbreak hermetic build

The xvm codec kill depends on utxo/wire's TransferableOut/In + nftfx/propertyfx
envelopes, which were only in the local ~/work/lux/utxo working tree (pinned via
'replace github.com/luxfi/utxo => ../utxo'). That local-path replace works for a
local build but breaks the hermetic Docker/CI build ('open /utxo/go.mod: no such
file or directory'). Published those two additive wire commits as utxo v0.5.1
(clean ff on utxo main, +2 over v0.5.0) and pin it here — the exact code node was
built+tested against. Dropped the replace. Cold-cache 'go mod download all' is now
clean; xvm/components/lux/wallet tests green against v0.5.1.

Co-authored-by: Hanzo Dev <dev@hanzo.ai>

go.mod

@@ -143,7 +143,7 @@ require (
 	github.com/luxfi/timer v1.0.2
 	github.com/luxfi/units v1.0.0
 	github.com/luxfi/utils v1.2.0
-	github.com/luxfi/utxo v0.3.7
+	github.com/luxfi/utxo v0.5.1
 	github.com/luxfi/validators v1.2.0
 	github.com/luxfi/vm v1.2.7
 	github.com/luxfi/warp v1.24.0
@@ -261,5 +261,3 @@ require (
 )
 
 exclude github.com/ethereum/go-ethereum v1.10.26
-
-replace github.com/luxfi/utxo => ../utxo

go.sum

@@ -417,6 +417,8 @@ github.com/luxfi/upgrade v1.0.1 h1:7+ygYeUf/MuLeGL7pjIu6ckQimxctCp+Swybhpy64go=
 github.com/luxfi/upgrade v1.0.1/go.mod h1:Re7g9Y+SYf/LvkHFpN0vbtlVH/Rr5ZpHQdPeVFEo3Jw=
 github.com/luxfi/utils v1.2.0 h1:gtEiI7/NM6PQ/OasEpH0PvB+e5hIS/tpum9r64pYjMc=
 github.com/luxfi/utils v1.2.0/go.mod h1:T2OCKT1xG9jtKR/gyJQoSkticzrE9WFQ8eohJHGu9Fg=
+github.com/luxfi/utxo v0.5.1 h1:ncJ8tZhllb9k+NbBlkGydwGYBd2LrZOMvC8bfMDxorY=
+github.com/luxfi/utxo v0.5.1/go.mod h1:IY9sxRbOzkRXSx2nMcPKPkKX3R5ECl5s4CfUNQFQCus=
 github.com/luxfi/validators v1.2.0 h1:VygpiBqBAdGrfkb7xzE2yrVmnXaqE+hm8FLWdGXO7G8=
 github.com/luxfi/validators v1.2.0/go.mod h1:GYLulrNXAan23ZlX7sgWVbVnLpUexeB/m2qr2ymsXok=
 github.com/luxfi/version v1.0.1 h1:T/1KYWEMmsrNQk7pN7PFPAwh/7XbeX7cFAKLBqI37Sk=