build(deps): Bump github.com/creachadair/taskgroup from 0.3.2 to 0.6.0

Bumps [github.com/creachadair/taskgroup](https://github.com/creachadair/taskgroup) from 0.3.2 to 0.6.0.
- [Commits](creachadair/taskgroup@v0.3.2...v0.6.0)

---
updated-dependencies:
- dependency-name: github.com/creachadair/taskgroup
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

go.mod

@@ -11,7 +11,7 @@ require (
 	github.com/btcsuite/btcutil v1.0.3-0.20201208143702-a53e38424cce
 	github.com/bufbuild/buf v1.25.0
 	github.com/cenkalti/backoff v2.2.1+incompatible // indirect
-	github.com/creachadair/taskgroup v0.3.2
+	github.com/creachadair/taskgroup v0.6.0
 	github.com/fortytw2/leaktest v1.3.0
 	github.com/go-kit/kit v0.12.0
 	github.com/go-kit/log v0.2.1
@@ -49,6 +49,7 @@ require (
 	gopkg.in/natefinch/lumberjack.v2 v2.2.1
 	gopkg.in/yaml.v3 v3.0.1
 )
+
 // ========================================
 
 require (

go.sum

@@ -249,8 +249,8 @@ github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d/go.mod h1:ma
 github.com/cpuguy83/go-md2man/v2 v2.0.0/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
 github.com/cpuguy83/go-md2man/v2 v2.0.2 h1:p1EgwI/C7NhT0JmVkwCD2ZBK8j4aeHQX2pMHHBfMQ6w=
 github.com/cpuguy83/go-md2man/v2 v2.0.2/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
-github.com/creachadair/taskgroup v0.3.2 h1:zlfutDS+5XG40AOxcHDSThxKzns8Tnr9jnr6VqkYlkM=
-github.com/creachadair/taskgroup v0.3.2/go.mod h1:wieWwecHVzsidg2CsUnFinW1faVN4+kq+TDlRJQ0Wbk=
+github.com/creachadair/taskgroup v0.6.0 h1:DogJ77FOD+9ZyQcD2cPn9Ivz6a607iPu+qC9CG/+mgo=
+github.com/creachadair/taskgroup v0.6.0/go.mod h1:e1kO+tKiCfDiDiwHei/dXgz3i9kQ8b5inEUVsrGmFfw=
 github.com/creack/pty v1.1.7/go.mod h1:lj5s0c3V2DBrqTV7llrYr5NG6My20zk30Fl46Y7DoTY=
 github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
 github.com/creack/pty v1.1.18 h1:n56/Zwd5o6whRC5PMGretI4IdRLlmBXYNjScPaBgsbY=