chore(deps): Bump golang.org/x/sync from 0.5.0 to 0.6.0 (#283)

Bumps [golang.org/x/sync](https://github.com/golang/sync) from 0.5.0 to
0.6.0.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/golang/sync/commit/59c1ca1e4661ed4452be4069ceea3c233f4deec1"><code>59c1ca1</code></a>
errgroup: add reference to sync.WaitGroup</li>
<li>See full diff in <a
href="https://github.com/golang/sync/compare/v0.5.0...v0.6.0">compare
view</a></li>
</ul>
</details>
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go.mod

@@ -10,7 +10,7 @@ require (
 
 require (
 	github.com/klauspost/reedsolomon v1.12.0
-	golang.org/x/sync v0.5.0
+	golang.org/x/sync v0.6.0
 )
 
 require github.com/gogo/protobuf v1.3.2 // indirect

go.sum

@@ -53,8 +53,8 @@ golang.org/x/net v0.0.0-20201021035429-f5854403a974/go.mod h1:sp8m0HH+o8qH0wwXwY
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20201020160332-67f06af15bc9/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sync v0.5.0 h1:60k92dhOjHxJkrqnwsfl8KuaHbn/5dl0lUPUklKo3qE=
-golang.org/x/sync v0.5.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
+golang.org/x/sync v0.6.0 h1:5BMeUDZ7vkXGfEr1x9B4bRcTH4lpkTkpdh0T/J+qjbQ=
+golang.org/x/sync v0.6.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200930185726-fdedc70b468f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=