build(deps): Bump github.com/creachadair/taskgroup from 0.6.0 to 0.11.0

Bumps [github.com/creachadair/taskgroup](https://github.com/creachadair/taskgroup) from 0.6.0 to 0.11.0.
- [Commits](creachadair/taskgroup@v0.6.0...v0.11.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

go.mod

@@ -10,7 +10,7 @@ require (
 	github.com/btcsuite/btcd v0.22.1
 	github.com/btcsuite/btcutil v1.0.3-0.20201208143702-a53e38424cce
 	github.com/bufbuild/buf v1.25.0
-	github.com/creachadair/taskgroup v0.6.0
+	github.com/creachadair/taskgroup v0.11.0
 	github.com/fortytw2/leaktest v1.3.0
 	github.com/go-kit/kit v0.12.0
 	github.com/go-kit/log v0.2.1

go.sum

@@ -181,8 +181,8 @@ github.com/cpuguy83/go-md2man v1.0.10/go.mod h1:SmD6nW6nTyfqj6ABTjUi3V3JVMnlJmwc
 github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d/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 v0.6.0 h1:DogJ77FOD+9ZyQcD2cPn9Ivz6a607iPu+qC9CG/+mgo=
-github.com/creachadair/taskgroup v0.6.0/go.mod h1:e1kO+tKiCfDiDiwHei/dXgz3i9kQ8b5inEUVsrGmFfw=
+github.com/creachadair/taskgroup v0.11.0 h1:ALpBe7Qds+JyM4ZQKISLFyapHRjVb00eOQ88S0mzVNo=
+github.com/creachadair/taskgroup v0.11.0/go.mod h1:9oDDPt/5QPS4iylvPMC81GRlj+1je8AFDbjUh4zaQWo=
 github.com/creack/pty v1.1.18 h1:n56/Zwd5o6whRC5PMGretI4IdRLlmBXYNjScPaBgsbY=
 github.com/curioswitch/go-reassign v0.2.0 h1:G9UZyOcpk/d7Gd6mqYgd8XYWFMw/znxwGDUstnC9DIo=
 github.com/curioswitch/go-reassign v0.2.0/go.mod h1:x6OpXuWvgfQaMGks2BZybTngWjT84hqJfKoO8Tt/Roc=