build(deps): bump nmt to 0.19.0 (#1076)

## Motivation


#1073 (comment)

go.mod

@@ -54,7 +54,7 @@ require (
 	github.com/Masterminds/semver/v3 v3.2.0
 	github.com/btcsuite/btcd/btcec/v2 v2.2.1
 	github.com/btcsuite/btcd/btcutil v1.1.2
-	github.com/celestiaorg/nmt v0.18.0
+	github.com/celestiaorg/nmt v0.19.0
 	github.com/cometbft/cometbft-db v0.7.0
 	github.com/go-git/go-git/v5 v5.5.1
 	github.com/vektra/mockery/v2 v2.14.0

go.sum

@@ -150,8 +150,8 @@ github.com/bufbuild/protocompile v0.1.0/go.mod h1:ix/MMMdsT3fzxfw91dvbfzKW3fRRnu
 github.com/butuzov/ireturn v0.1.1 h1:QvrO2QF2+/Cx1WA/vETCIYBKtRjc30vesdoPUNo1EbY=
 github.com/butuzov/ireturn v0.1.1/go.mod h1:Wh6Zl3IMtTpaIKbmwzqi6olnM9ptYQxxVacMsOEFPoc=
 github.com/bwesterb/go-ristretto v1.2.0/go.mod h1:fUIoIZaG73pV5biE2Blr2xEzDoMj7NFEuV9ekS419A0=
-github.com/celestiaorg/nmt v0.18.0 h1:JUiKbAYVwGhPCN8Xn8+25A++luEb3q5K6KnReXihkIk=
-github.com/celestiaorg/nmt v0.18.0/go.mod h1:0l8q6UYRju1xNrxtvV6NwPdW3lfsN6KuZ0htRnModdc=
+github.com/celestiaorg/nmt v0.19.0 h1:9VXFeI/gt+q8h5HeCE0RjXJhOxsFzxJUjHrkvF9CMYE=
+github.com/celestiaorg/nmt v0.19.0/go.mod h1:Oz15Ub6YPez9uJV0heoU4WpFctxazuIhKyUtaYNio7E=
 github.com/cenkalti/backoff v2.2.1+incompatible h1:tNowT99t7UNflLxfYYSlKYsBpXdEet03Pg2g16Swow4=
 github.com/cenkalti/backoff v2.2.1+incompatible/go.mod h1:90ReRw6GdpyfrHakVjL/QHaoyV4aDUVVkXQJJJ3NXXM=
 github.com/cenkalti/backoff/v4 v4.1.3 h1:cFAlzYUlVYDysBEH2T5hyJZMh3+5+WCBvSnK6Q8UtC4=