chore: update to go-merkledag@v0.7.0

includes ipfs/go-merkledag#87 to keep deserialized
state of dag-pb blocks stable for stable traversals

go.mod

@@ -48,7 +48,7 @@ require (
 	github.com/ipfs/go-ipld-legacy v0.1.1
 	github.com/ipfs/go-ipns v0.1.2
 	github.com/ipfs/go-log v1.0.5
-	github.com/ipfs/go-merkledag v0.6.0
+	github.com/ipfs/go-merkledag v0.6.1-0.20220817070129-31cdb6f79253
 	github.com/ipfs/go-metrics-interface v0.0.1
 	github.com/ipfs/go-metrics-prometheus v0.0.2
 	github.com/ipfs/go-mfs v0.2.1

go.sum

@@ -625,8 +625,9 @@ github.com/ipfs/go-merkledag v0.0.6/go.mod h1:QYPdnlvkOg7GnQRofu9XZimC5ZW5Wi3bKy
 github.com/ipfs/go-merkledag v0.2.3/go.mod h1:SQiXrtSts3KGNmgOzMICy5c0POOpUNQLvB3ClKnBAlk=
 github.com/ipfs/go-merkledag v0.3.2/go.mod h1:fvkZNNZixVW6cKSZ/JfLlON5OlgTXNdRLz0p6QG/I2M=
 github.com/ipfs/go-merkledag v0.5.1/go.mod h1:cLMZXx8J08idkp5+id62iVftUQV+HlYJ3PIhDfZsjA4=
-github.com/ipfs/go-merkledag v0.6.0 h1:oV5WT2321tS4YQVOPgIrWHvJ0lJobRTerU+i9nmUCuA=
 github.com/ipfs/go-merkledag v0.6.0/go.mod h1:9HSEwRd5sV+lbykiYP+2NC/3o6MZbKNaa4hfNcH5iH0=
+github.com/ipfs/go-merkledag v0.6.1-0.20220817070129-31cdb6f79253 h1:e4owHhlduWve+EOlE/0Xxs5F0GFHzb59E2nmxUxfgtQ=
+github.com/ipfs/go-merkledag v0.6.1-0.20220817070129-31cdb6f79253/go.mod h1:y8MUapQdCanqgFDw/V0SjI8GGwHMNfkfD2cJUOjBVYY=
 github.com/ipfs/go-metrics-interface v0.0.1 h1:j+cpbjYvu4R8zbleSs36gvB7jR+wsL2fGD6n0jO4kdg=
 github.com/ipfs/go-metrics-interface v0.0.1/go.mod h1:6s6euYU4zowdslK0GKHmqaIZ3j/b/tL7HTWtJ4VPgWY=
 github.com/ipfs/go-metrics-prometheus v0.0.2 h1:9i2iljLg12S78OhC6UAiXi176xvQGiZaGVF1CUVdE+s=