Bump golang.org/x/sync from 0.5.0 to 0.6.0 (#41)

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

@@ -4,7 +4,7 @@ go 1.20
 
 require (
 	github.com/google/go-containerregistry v0.17.0
-	golang.org/x/sync v0.5.0
+	golang.org/x/sync v0.6.0
 	knative.dev/pkg v0.0.0-20230502134655-db8a35330281
 )
 

go.sum

@@ -43,8 +43,8 @@ github.com/stretchr/testify v1.8.1/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o
 github.com/urfave/cli v1.22.12/go.mod h1:sSBEIC79qR6OvcmsD4U3KABeOTxDqQtdDnaFuUN30b8=
 github.com/vbatts/tar-split v0.11.3 h1:hLFqsOLQ1SsppQNTMpkpPXClLDfC2A3Zgy9OUU+RVck=
 github.com/vbatts/tar-split v0.11.3/go.mod h1:9QlHN18E+fEH7RdG+QAJJcuya3rqT7eXSTY7wGrAokY=
-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 v0.0.0-20220715151400-c0bba94af5f8/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220906165534-d0df966e6959/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.8.0 h1:EBmGv8NaZBZTWvrbjNoL6HVt+IVy3QDQpJs7VRIw3tU=