build(deps): bump github.com/ipfs/go-merkledag

Bumps [github.com/ipfs/go-merkledag](https://github.com/ipfs/go-merkledag) from 0.7.0 to 0.8.1.
- [Release notes](https://github.com/ipfs/go-merkledag/releases)
- [Commits](https://github.com/ipfs/go-merkledag/compare/v0.7.0...v0.8.1)

---
updated-dependencies:
- dependency-name: github.com/ipfs/go-merkledag
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

packages/networking/ipfs-cluster/go.mod

@@ -34,7 +34,7 @@ require (
 	github.com/ipfs/go-ipld-format v0.4.0
 	github.com/ipfs/go-ipns v0.2.0
 	github.com/ipfs/go-log/v2 v2.5.1
-	github.com/ipfs/go-merkledag v0.7.0
+	github.com/ipfs/go-merkledag v0.8.1
 	github.com/ipfs/go-mfs v0.1.3-0.20210507195338-96fbfa122164
 	github.com/ipfs/go-path v0.3.0
 	github.com/ipfs/go-unixfs v0.4.0

packages/networking/ipfs-cluster/go.sum

@@ -597,8 +597,8 @@ 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 v0.7.0 h1:PHdWOGwx+J2uRAuP9Mu+bz89ulmf3W2QmbSS/N6O29U=
-github.com/ipfs/go-merkledag v0.7.0/go.mod h1:/1cuN4VbcDn/xbVMAqjPUwejJYr8W9SvizmyYLU/B7k=
+github.com/ipfs/go-merkledag v0.8.1 h1:N3yrqSre/ffvdwtHL4MXy0n7XH+VzN8DlzDrJySPa94=
+github.com/ipfs/go-merkledag v0.8.1/go.mod h1:uYUlWE34GhbcTjGuUDEcdPzsEtOdnOupL64NgSRjmWI=
 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-mfs v0.1.3-0.20210507195338-96fbfa122164 h1:0ATu9s5KktHhm8aYRSe1ysOJPik3dRwU/uag1Bcz+tg=